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A Literature Review: Website Design and User Engagement

Renee garett.

1 ElevateU, Los Angeles, CA, USA

Sean D. Young

2 University of California Institute for Prediction Technology, Department of Family Medicine, University of California, Los Angeles, Los Angeles, CA, USA

3 UCLA Center for Digital Behavior, Department of Family Medicine, University of California, Los Angeles, Los Angeles, CA, USA

Proper design has become a critical element needed to engage website and mobile application users. However, little research has been conducted to define the specific elements used in effective website and mobile application design. We attempt to review and consolidate research on effective design and to define a short list of elements frequently used in research. The design elements mentioned most frequently in the reviewed literature were navigation, graphical representation, organization, content utility, purpose, simplicity, and readability. We discuss how previous studies define and evaluate these seven elements. This review and the resulting short list of design elements may be used to help designers and researchers to operationalize best practices for facilitating and predicting user engagement.

1. INTRODUCTION

Internet usage has increased tremendously and rapidly in the past decade ( “Internet Use Over Time,” 2014 ). Websites have become the most important public communication portal for most, if not all, businesses and organizations. As of 2014, 87% of American adults aged 18 or older are Internet users ( “Internet User Demographics,” 2013 ). Because business-to-consumer interactions mainly occur online, website design is critical in engaging users ( Flavián, Guinalíu, & Gurrea, 2006 ; Lee & Kozar, 2012 ; Petre, Minocha, & Roberts, 2006 ). Poorly designed websites may frustrate users and result in a high “bounce rate”, or people visiting the entrance page without exploring other pages within the site ( Google.com, 2015 ). On the other hand, a well-designed website with high usability has been found to positively influence visitor retention (revisit rates) and purchasing behavior ( Avouris, Tselios, Fidas, & Papachristos, 2003 ; Flavián et al., 2006 ; Lee & Kozar, 2012 ).

Little research, however, has been conducted to define the specific elements that constitute effective website design. One of the key design measures is usability ( International Standardization Organization, 1998 ). The International Standardized Organization (ISO) defines usability as the extent to which users can achieve desired tasks (e.g., access desired information or place a purchase) with effectiveness (completeness and accuracy of the task), efficiency (time spent on the task), and satisfaction (user experience) within a system. However, there is currently no consensus on how to properly operationalize and assess website usability ( Lee & Kozar, 2012 ). For example, Nielson associates usability with learnability, efficiency, memorability, errors, and satisfaction ( Nielsen, 2012 ). Yet, Palmer (2002) postulates that usability is determined by download time, navigation, content, interactivity, and responsiveness. Similar to usability, many other key design elements, such as scannability, readability, and visual aesthetics, have not yet been clearly defined ( Bevan, 1997 ; Brady & Phillips, 2003 ; Kim, Lee, Han, & Lee, 2002 ), and there are no clear guidelines that individuals can follow when designing websites to increase engagement.

This review sought to address that question by identifying and consolidating the key website design elements that influence user engagement according to prior research studies. This review aimed to determine the website design elements that are most commonly shown or suggested to increase user engagement. Based on these findings, we listed and defined a short list of website design elements that best facilitate and predict user engagement. The work is thus an exploratory research providing definitions for these elements of website design and a starting point for future research to reference.

2. MATERIALS AND METHODS

2.1. selection criteria and data extraction.

We searched for articles relating to website design on Google Scholar (scholar.google.com) because Google Scholar consolidates papers across research databases (e.g., Pubmed) and research on design is listed in multiple databases. We used the following combination of keywords: design, usability, and websites. Google Scholar yielded 115,000 total hits. However, due to the large list of studies generated, we decided to only review the top 100 listed research studies for this exploratory study. Our inclusion criteria for the studies was: (1) publication in a peer-reviewed academic journal, (2) publication in English, and (3) publication in or after 2000. Year of publication was chosen as a limiting factor so that we would have enough years of research to identify relevant studies but also have results that relate to similar styles of websites after the year 2000. We included studies that were experimental or theoretical (review papers and commentaries) in nature. Resulting studies represented a diverse range of disciplines, including human-computer interaction, marketing, e-commerce, interface design, cognitive science, and library science. Based on these selection criteria, thirty-five unique studies remained and were included in this review.

2.2. Final Search Term

(design) and (usability) and (websites).

The search terms were kept simple to capture the higher level design/usability papers and allow Google scholar’s ranking method to filter out the most popular studies. This method also allowed studies from a large range of fields to be searched.

2.3. Analysis

The literature review uncovered 20 distinct design elements commonly discussed in research that affect user engagement. They were (1) organization – is the website logically organized, (2) content utility – is the information provided useful or interesting, (3) navigation – is the website easy to navigate, (4) graphical representation – does the website utilize icons, contrasting colors, and multimedia content, (5) purpose – does the website clearly state its purpose (i.e. personal, commercial, or educational), (6) memorable elements – does the website facilitate returning users to navigate the site effectively (e.g., through layout or graphics), (7) valid links – does the website provide valid links, (8) simplicity – is the design of the website simple, (9) impartiality – is the information provided fair and objective, (10) credibility – is the information provided credible, (11) consistency/reliability – is the website consistently designed (i.e., no changes in page layout throughout the site), (12) accuracy – is the information accurate, (13) loading speed – does the website take a long time to load, (14) security/privacy – does the website securely transmit, store, and display personal information/data, (15) interactive – can the user interact with the website (e.g., post comments or receive recommendations for similar purchases), (16) strong user control capabilities– does the website allow individuals to customize their experiences (such as the order of information they access and speed at which they browse the website), (17) readability – is the website easy to read and understand (e.g., no grammatical/spelling errors), (18) efficiency – is the information presented in a way that users can find the information they need quickly, (19) scannability – can users pick out relevant information quickly, and (20) learnability – how steep is the learning curve for using the website. For each of the above, we calculated the proportion of studies mentioning the element. In this review, we provide a threshold value of 30%. We identified elements that were used in at least 30% of the studies and include these elements that are above the threshold on a short list of elements used in research on proper website design. The 30% value was an arbitrary threshold picked that would provide researchers and designers with a guideline list of elements described in research on effective web design. To provide further information on how to apply this list, we present specific details on how each of these elements was discussed in research so that it can be defined and operationalized.

3.1. Popular website design elements ( Table 1 )

Frequency of website design elements used in research (2000–2014)

Seven of the website design elements met our threshold requirement for review. Navigation was the most frequently discussed element, mentioned in 22 articles (62.86%). Twenty-one studies (60%) highlighted the importance of graphics. Fifteen studies (42.86%) emphasized good organization. Four other elements also exceeded the threshold level, and they were content utility (n=13, 37.14%), purpose (n=11, 31.43%), simplicity (n=11, 31.43%), and readability (n=11, 31.43%).

Elements below our minimum requirement for review include memorable features (n=5, 14.29%), links (n=10, 28.57%), impartiality (n=1, 2.86%), credibility (n=7, 20%), consistency/reliability (n=8. 22.86%), accuracy (n=5, 14.29%), loading speed (n=10, 28.57%), security/privacy (n=2, 5.71%), interactive features (n=9, 25.71%), strong user control capabilities (n=8, 22.86%), efficiency (n=6, 17.14%), scannability (n=1, 2.86%), and learnability (n=2, 5.71%).

3.2. Defining key design elements for user engagement ( Table 2 )

Definitions of Key Design Elements

In defining and operationalizing each of these elements, the research studies suggested that effective navigation is the presence of salient and consistent menu/navigation bars, aids for navigation (e.g., visible links), search features, and easy access to pages (multiple pathways and limited clicks/backtracking). Engaging graphical presentation entails 1) inclusion of images, 2) proper size and resolution of images, 3) multimedia content, 4) proper color, font, and size of text, 5) use of logos and icons, 6) attractive visual layout, 7) color schemes, and 8) effective use of white space. Optimal organization includes 1) cognitive architecture, 2) logical, understandable, and hierarchical structure, 3) information arrangement and categorization, 4) meaningful labels/headings/titles, and 5) use of keywords. Content utility is determined by 1) sufficient amount of information to attract repeat visitors, 2) arousal/motivation (keeps visitors interested and motivates users to continue exploring the site), 3) content quality, 4) information relevant to the purpose of the site, and 5) perceived utility based on user needs/requirements. The purpose of a website is clear when it 1) establishes a unique and visible brand/identity, 2) addresses visitors’ intended purpose and expectations for visiting the site, and 3) provides information about the organization and/or services. Simplicity is achieved by using 1) simple subject headings, 2) transparency of information (reduce search time), 3) website design optimized for computer screens, 4) uncluttered layout, 5) consistency in design throughout website, 6) ease of using (including first-time users), 7) minimize redundant features, and 8) easily understandable functions. Readability is optimized by content that is 1) easy to read, 2) well-written, 3) grammatically correct, 4) understandable, 5) presented in readable blocks, and 6) reading level appropriate.

4. DISCUSSION

The seven website design elements most often discussed in relation to user engagement in the reviewed studies were navigation (62.86%), graphical representation (60%), organization (42.86%), content utility (37.14%), purpose (31.43%), simplicity (31.43%), and readability (31.43%). These seven elements exceeded our threshold level of 30% representation in the literature and were included into a short list of website design elements to operationalize effective website design. For further analysis, we reviewed how studies defined and evaluated these seven elements. This may allow designers and researchers to determine and follow best practices for facilitating or predicting user engagement.

A remaining challenge is that the definitions of website design elements often overlap. For example, several studies evaluated organization by how well a website incorporates cognitive architecture, logical and hierarchical structure, systematic information arrangement and categorization, meaningful headings and labels, and keywords. However, these features are also crucial in navigation design. Also, the implications of using distinct logos and icons go beyond graphical representation. Logos and icons also establish unique brand/identity for the organization (purpose) and can serve as visual aids for navigation. Future studies are needed to develop distinct and objective measures to assess these elements and how they affect user engagement ( Lee & Kozar, 2012 ).

Given the rapid increase in both mobile technology and social media use, it is surprising that no studies mentioned cross-platform compatibility and social media integration. In 2013, 34% of cellphone owners primarily use their cellphones to access the Internet, and this number continues to grow ( “Mobile Technology Factsheet,” 2013 ). With the rise of different mobile devices, users are also diversifying their web browser use. Internet Explorer (IE) was once the leading web browser. However, in recent years, FireFox, Safari, and Chrome have gained significant traction ( W3schools.com, 2015 ). Website designers and researchers must be mindful of different platforms and browsers to minimize the risk of losing users due to compatibility issues. In addition, roughly 74% of American Internet users use some form of social media ( Duggan, Ellison, Lampe, Lenhart, & Smith, 2015 ), and social media has emerged as an effective platform for organizations to target and interact with users. Integrating social media into website design may increase user engagement by facilitating participation and interactivity.

There are several limitations to the current review. First, due to the large number of studies published in this area and due to this study being exploratory, we selected from the first 100 research publications on Google Scholar search results. Future studies may benefit from defining design to a specific topic, set of years, or other area to limit the number of search results. Second, we did not quantitatively evaluate the effectiveness of these website design elements. Additional research can help to better quantify these elements.

It should also be noted that different disciplines and industries have different objectives in designing websites and should thus prioritize different website design elements. For example, online businesses and marketers seek to design websites that optimize brand loyalty, purchase, and profit ( Petre et al., 2006 ). Others, such as academic researchers or healthcare providers, are more likely to prioritize privacy/confidentiality, and content accuracy in building websites ( Horvath, Ecklund, Hunt, Nelson, & Toomey, 2015 ). Ultimately, we advise website designers and researchers to consider the design elements delineated in this review, along with their unique needs, when developing user engagement strategies.

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A Literature Review: Website Design and User Engagement

Affiliations.

  • 1 ElevateU, Los Angeles, CA, USA.
  • 2 University of California Institute for Prediction Technology, Department of Family Medicine, University of California, Los Angeles, Los Angeles, CA, USA; UCLA Center for Digital Behavior, Department of Family Medicine, University of California, Los Angeles, Los Angeles, CA, USA.
  • PMID: 27499833
  • PMCID: PMC4974011

Proper design has become a critical element needed to engage website and mobile application users. However, little research has been conducted to define the specific elements used in effective website and mobile application design. We attempt to review and consolidate research on effective design and to define a short list of elements frequently used in research. The design elements mentioned most frequently in the reviewed literature were navigation, graphical representation, organization, content utility, purpose, simplicity, and readability. We discuss how previous studies define and evaluate these seven elements. This review and the resulting short list of design elements may be used to help designers and researchers to operationalize best practices for facilitating and predicting user engagement.

Keywords: Website design; navigation; organization; simplicity; usability.

Grants and funding

  • K01 MH090884/MH/NIMH NIH HHS/United States
  • R01 MH106415/MH/NIMH NIH HHS/United States
  • R21 DA039458/DA/NIDA NIH HHS/United States

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A Literature Review: Website Design and User Engagement.

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  • Chiu, Jason ;
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  • Young, Sean D

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Proper design has become a critical element needed to engage website and mobile application users. However, little research has been conducted to define the specific elements used in effective website and mobile application design. We attempt to review and consolidate research on effective design and to define a short list of elements frequently used in research. The design elements mentioned most frequently in the reviewed literature were navigation, graphical representation, organization, content utility, purpose, simplicity, and readability. We discuss how previous studies define and evaluate these seven elements. This review and the resulting short list of design elements may be used to help designers and researchers to operationalize best practices for facilitating and predicting user engagement.

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A Systematic Review of Adaptive and Responsive Design Approaches for World Wide Web

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literature review website development

  • Nazish Yousaf 17 ,
  • Wasi Haider Butt 17 ,
  • Farooque Azam 17 &
  • Muhammad Waseem Anwar 17  

Part of the book series: Advances in Intelligent Systems and Computing ((AISC,volume 887))

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  • Future of Information and Communication Conference

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World Wide Web (WWW) in today’s age is used on different devices. These devices communicate with each other thus creating a design problem of layouts and data mismatch. Consequently, there is a strong need of visualizing and envisioning web data with proper customization suiting different types of users. The purpose of this Systematic Literature Review (SLR) is to investigate the two widely used web based designs i.e. Adaptive Web Design (AWD) and Responsive Web Design (RWD). Particularly, a systematic literature review has been used to identify 58 research works, published during 2009–2017. Consequently, we identify 23 research works regarding AWD, 14 research works related to RWD and 21 research works pertaining to both AWD and RWD. Moreover, 4 significant tools and 13 leading techniques have been identified in the context of AWD and RWD implementation. Finally, significant aspects of two web development approaches (AWD and RWD) are also compared with the traditional web design. It has been concluded that the traditional web design is not sufficient to fulfill the needs of ever-growing web users all around the globe. Therefore, the combination of both AWD and RWD is essential to meet the technological advancements in WWW.

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Yousaf, N., Butt, W.H., Azam, F., Anwar, M.W. (2019). A Systematic Review of Adaptive and Responsive Design Approaches for World Wide Web. In: Arai, K., Kapoor, S., Bhatia, R. (eds) Advances in Information and Communication Networks. FICC 2018. Advances in Intelligent Systems and Computing, vol 887. Springer, Cham. https://doi.org/10.1007/978-3-030-03405-4_50

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Published on 24.10.2019 in Vol 3 , No 4 (2019) : Oct-Dec

A Comprehensive Framework to Evaluate Websites: Literature Review and Development of GoodWeb

Authors of this article:

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  • Rosalie Allison, BSc, MSc   ; 
  • Catherine Hayes, BSc   ; 
  • Cliodna A M McNulty, MBBS, FRCP   ; 
  • Vicki Young, BSc, PhD  

Public Health England, Gloucester, United Kingdom

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Rosalie Allison, BSc, MSc

Public Health England

Primary Care and Interventions Unit

Gloucester, GL1 1DQ

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Background: Attention is turning toward increasing the quality of websites and quality evaluation to attract new users and retain existing users.

Objective: This scoping study aimed to review and define existing worldwide methodologies and techniques to evaluate websites and provide a framework of appropriate website attributes that could be applied to any future website evaluations.

Methods: We systematically searched electronic databases and gray literature for studies of website evaluation. The results were exported to EndNote software, duplicates were removed, and eligible studies were identified. The results have been presented in narrative form.

Results: A total of 69 studies met the inclusion criteria. The extracted data included type of website, aim or purpose of the study, study populations (users and experts), sample size, setting (controlled environment and remotely assessed), website attributes evaluated, process of methodology, and process of analysis. Methods of evaluation varied and included questionnaires, observed website browsing, interviews or focus groups, and Web usage analysis. Evaluations using both users and experts and controlled and remote settings are represented. Website attributes that were examined included usability or ease of use, content, design criteria, functionality, appearance, interactivity, satisfaction, and loyalty. Website evaluation methods should be tailored to the needs of specific websites and individual aims of evaluations. GoodWeb, a website evaluation guide, has been presented with a case scenario.

Conclusions: This scoping study supports the open debate of defining the quality of websites, and there are numerous approaches and models to evaluate it. However, as this study provides a framework of the existing literature of website evaluation, it presents a guide of options for evaluating websites, including which attributes to analyze and options for appropriate methods.

Introduction

Since its conception in the early 1990s, there has been an explosion in the use of the internet, with websites taking a central role in diverse fields such as finance, education, medicine, industry, and business. Organizations are increasingly attempting to exploit the benefits of the World Wide Web and its features as an interface for internet-enabled businesses, information provision, and promotional activities [ 1 , 2 ]. As the environment becomes more competitive and websites become more sophisticated, attention is turning toward increasing the quality of the website itself and quality evaluation to attract new and retain existing users [ 3 , 4 ]. What determines website quality has not been conclusively established, and there are many different definitions and meanings of the term quality, mainly in relation to the website’s purpose [ 5 ]. Traditionally, website evaluations have focused on usability, defined as “the extent to which a product can be used by specified users to achieve specified goals with effectiveness, efficiency and satisfaction in a specified context of use [ 6 ].” The design of websites and users’ needs go beyond pure usability, as increased engagement and pleasure experienced during interactions with websites can be more important predictors of website preference than usability [ 7 - 10 ]. Therefore, in the last decade, website evaluations have shifted their focus to users’ experience, employing various assessment techniques [ 11 ], with no universally accepted method or procedure for website evaluation.

This scoping study aimed to review and define existing worldwide methodologies and techniques to evaluate websites and provide a simple framework of appropriate website attributes, which could be applied to future website evaluations.

A scoping study is similar to a systematic review as it collects and reviews content in a field of interest. However, scoping studies cover a broader question and do not rigorously evaluate the quality of the studies included [ 12 ]. Scoping studies are commonly used in the fields of public services such as health and education, as they are more rapid to perform and less costly in terms of staff costs [ 13 ]. Scoping studies can be precursors to a systematic review or stand-alone studies to examine the range of research around a particular topic.

The following research question is based on the need to gain knowledge and insight from worldwide website evaluation to inform the future study design of website evaluations: what website evaluation methodologies can be robustly used to assess users’ experience?

To show how the framework of attributes and methods can be applied to evaluating a website, e-Bug, an international educational health website, will be used as a case scenario [ 14 ].

This scoping study followed a 5-stage framework and methodology, as outlined by Arksey and O’Malley [ 12 ], involving the following: (1) identifying the research question, as above; (2) identifying relevant studies; (3) study selection; (4) charting the data; and (5) collating, summarizing, and reporting the results.

Identifying Relevant Studies

Following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines [ 15 ], studies for consideration in the review were located by searching the following electronic databases: Excerpta Medica dataBASE, PsycINFO, Cochrane, Cumulative Index to Nursing and Allied Health Literature, Scopus, ACM digital library, and IEEE Xplore SPORTDiscus. The keywords used referred to the following:

  • Population: websites
  • Intervention: evaluation methodologies
  • Outcome: user’s experience.

Table 1 shows the specific search criteria for each database. These keywords were also used to search gray literature for unpublished or working documents to minimize publication bias.

a EMBASE: Excerpta Medica database.

b CINAHL: Cumulative Index to Nursing and Allied Health Literature.

c ACM: Association for Computing Machinery.

d IEEE: Institute of Electrical and Electronics Engineers.

Study Selection

Once all sources had been systematically searched, the list of citations was exported to EndNote software to identify eligible studies. By scanning the title, and abstract if necessary, studies that did not fit the inclusion criteria were removed by 2 researchers (RA and CH). As abstracts are not always representative of the full study that follows or capture the full scope [ 16 ], if the title and abstract did not provide sufficient information, the full manuscript was examined to ascertain whether they met all the inclusion criteria, which included (1) studies focused on websites, (2) studies of evaluative methods (eg, use of questionnaire and task completion), (3) studies that reported outcomes that affect the user’s experience (eg, quality, satisfaction, efficiency, effectiveness without necessarily focusing on methodology), (4) studies carried out between 2006 and 2016, (5) studies published in English, and (6) type of study (any study design that is appropriate).

Exclusion criteria included (1) studies that focus on evaluations using solely experts and are not transferrable to user evaluations; (2) studies that are in the form of electronic book or are not freely available on the Web or through OpenAthens, the University of Bath library, or the University of the West of England library; (3)studies that evaluate banking, electronic commerce (e-commerce), or online libraries’ websites and do not have transferrable measures to a range of other websites; (4) studies that report exclusively on minority or special needs groups (eg, blind or deaf users); and (5) studies that do not meet all the inclusion criteria.

Charting the Data

The next stage involved charting key items of information obtained from studies being reviewed. Charting [ 17 ] describes a technique for synthesizing and interpreting qualitative data by sifting, charting, and sorting material according to key issues and themes. This is similar to a systematic review in which the process is called data extraction. The data extracted included general information about the study and specific information relating to, for instance, the study population or target, the type of intervention, outcome measures employed, and the study design.

The information of interest included the following: type of website, aim or purpose of the study, study populations (users and experts), sample size, setting (laboratory, real life, and remotely assessed), website attributes evaluated, process of methodology, and process of analysis.

NVivo version 10.0 software was used for this stage by 2 researchers (RA and CH) to chart the data.

Collating, Summarizing, and Reporting the Results

Although the scoping study does not seek to assess the quality of evidence, it does present an overview of all material reviewed with a narrative account of findings.

Ethics Approval and Consent to Participate

As no primary research was carried out, no ethical approval was required to undertake this scoping study. No specific reference was made to any of the participants in the individual studies, nor does this study infringe on their rights in any way.

The electronic database searches produced 6657 papers; a further 7 papers were identified through other sources. After removing duplicates (n=1058), 5606 publications remained. After titles and abstracts were examined, 784 full-text papers were read and assessed further for eligibility. Of those, 69 articles were identified as suitable by meeting all the inclusion criteria ( Figure 1 ).

literature review website development

Study Characteristics

Studies referred to or used a mixture of users (72%) and experts (39%) to evaluate their websites; 54% used a controlled environment, and 26% evaluated websites remotely ( Multimedia Appendix 1 [ 2 - 4 , 11 , 18 - 85 ]). Remote usability, in its most basic form, involves working with participants who are not in the same physical location as the researcher, employing techniques such as live screen sharing or questionnaires. Advantages to remote website evaluations include the ability to evaluate using a larger number of participants as travel time and costs are not a factor, and participants are able to partake at a time that is appropriate to them, increasing the likelihood of participation and the possibility of a greater diversity of participants [ 18 ]. However, the disadvantages of remote website evaluations, in comparison with a controlled setting, are that system performance, network traffic, and the participant’s computer setup can all affect the results.

A variety of types of websites evaluated were included in this review including government (9%), online news (6%), education (1%), university (12%), and sports organizations (4%). The aspects of quality considered, and their relative importance varied according to the type of website and the goals to be achieved by the users. For example, criteria such as ease of paying or security are not very important to educational websites, whereas they are especially important for online shopping. In this sense, much attention must be paid when evaluating the quality of a website, establishing a specific context of use and purpose [ 19 ].

The context of the participants was also discussed, in relation to the generalizability of results. For example, when evaluations used potential or current users of their website, it was important that computer literacy was reflective of all users [ 20 ]. This could mean ensuring that participants with a range of computer abilities and experiences were used so that results were not biased to the most or least experienced users.

Intervention

A total of 43 evaluation methodologies were identified in the 69 studies in this review. Most of them were variations of similar methodologies, and a brief description of each is provided in Multimedia Appendix 2 . Multimedia Appendix 3 shows the methods used or described in each study.

Questionnaire

Use of questionnaires was the most common methodology referred to (37/69, 54%), including questions to rank or rate attributes and open questions to allow text feedback and suggested improvements. Questionnaires were used in a combination of before or after usability testing to assess usability and overall user experience.

Observed Browsing the Website

Browsing the website using a form of task completion with the participant, such as cognitive walkthrough, was used in 33/69 studies (48%), whereby an expert evaluator used a detailed procedure to simulate task execution and browse all particular solution paths, examining each action while determining if expected user’s goals and memory content would lead to choosing a correct option [ 30 ]. Screen capture was often used (n=6) to record participants’ navigation through the website, and eye tracking was used (n=7) to assess where the eye focuses on each page or the motion of the eye as an individual views a Web page. The think-aloud protocol was used (n=10) to encourage users to express out loud what they were looking at, thinking, doing, and feeling, as they performed tasks. This allows observers to see and understand the cognitive processes associated with task completion. Recording the time to complete tasks (n=6) and mouse movement or clicks (n=8) were used to assess the efficiency of the websites.

Qualitative Data Collection

Several forms of qualitative data collection were used in 27/69 studies (39%). Observed browsing, interviews, and focus groups were used either before or after the use of the website. Pre-website-use, qualitative research was often used to collect details of which website attributes were important for participants or what weighting participants would give to each attribute. Postevaluation, qualitative techniques were used to collate feedback on the quality of the website and any suggestions for improvements.

Automated Usability Evaluation Software

In 9/69 studies (13%), automated usability evaluation focused on developing software, tools, and techniques to speed evaluation (rapid), tools that reach a wider audience for usability testing (remote), and tools that have built-in analyses features (automated). The latter can involve assessing server logs, website coding, and simulations of user experience to assess usability [ 42 ].

Card Sorting

A technique that is often linked with assessing navigability of a website, card sorting, is useful for discovering the logical structure of an unsorted list of statements or ideas by exploring how people group items and structures that maximize the probability of users finding items (5/69 studies, 7%). This can assist with determining effective website structure.

Web Usage Analysis

Of 69 studies, 3 studies used Web usage analysis or Web analytics to identify browsing patterns by analyzing the participants’ navigational behavior. This could include tracking at the widget level, that is, combining knowledge of the mouse coordinates with elements such as buttons and links, with the layout of the HTML pages, enabling complete tracking of all user activity.

Outcomes (Attributes Used to Evaluate Websites)

Often, different terminology for website attributes was used to describe the same or similar concepts ( Multimedia Appendix 4 ). The most used website attributes that were assessed can be broken down into 8 broad categories and further subcategories:

  • Usability or ease of use is the degree to which a website can be used to achieve given goals (n=58). It includes navigation such as intuitiveness, learnability, memorability, and information architecture; effectiveness such as errors; and efficiency.
  • Content (n=41) includes completeness, accuracy, relevancy, timeliness, and understandability of the information.
  • Web design criteria (n=29) include use of media, search engines, help resources, originality of the website, site map, user interface, multilanguage, and maintainability.
  • Functionality (n=31) includes links, website speed, security, and compatibility with devices and browsers.
  • Appearance (n=26) includes layout, font, colors, and page length.
  • Interactivity (n=25) includes sense of community, such as ability to leave feedback and comments and email or share with a friend option or forum discussion boards; personalization; help options such as frequently answered questions or customer services; and background music.
  • Satisfaction (n=26) includes usefulness, entertainment, look and feel, and pleasure.
  • Loyalty (n=8) includes first impression of the website.

GoodWeb: Website Evaluation Guide

As there was such a range of methods used, a suggested guide of options for evaluating websites is presented below ( Figure 2 ), coined GoodWeb, and applied to an evaluation of e-Bug, an international educational health website [ 14 ]. Allison at al [ 86 ] show the full details of how GoodWeb has been applied and outcomes of the e-Bug website evaluation.

literature review website development

Step 1. What Are the Important Website Attributes That Affect User's Experience of the Chosen Website?

Usability or ease of use, content, Web design criteria, functionality, appearance, interactivity, satisfaction, and loyalty were the umbrella terms that encompassed the website attributes identified or evaluated in the 69 studies in this scoping study. Multimedia Appendix 4 contains a summary of the most used website attributes that have been assessed. Recent website evaluations have shifted focus from usability of websites to an overall user’s experience of website use. A decision on which website attributes to evaluate for specific websites could come from interviews or focus groups with users or experts or a literature search of attributes used in similar evaluations.

Application

In the scenario of evaluating e-Bug or similar educational health websites, the attributes chosen to assess could be the following:

  • Appearance: colors, fonts, media or graphics, page length, style consistency, and first impression
  • Content: clarity, completeness, current and timely information, relevance, reliability, and uniqueness
  • Interactivity: sense of community and modern features
  • Ease of use: home page indication, navigation, guidance, and multilanguage support
  • Technical adequacy: compatibility with other devices, load time, valid links, and limited use of special plug-ins
  • Satisfaction: loyalty

These cover the main website attributes appropriate for an educational health website. If the website did not currently have features such as search engines, site map, background music, it may not be appropriate to evaluate these, but may be better suited to question whether they would be suitable additions to the website; or these could be combined under the heading modern features . Furthermore, security may not be a necessary attribute to evaluate if participant identifiable information or bank details are not needed to use the website.

Step 2. What Is the Best Way to Evaluate These Attributes?

Often, a combination of methods is suitable to evaluate a website, as 1 method may not be appropriate to assess all attributes of interest [ 29 ] (see Multimedia Appendix 3 for a summary of the most used methods for evaluating websites). For example, screen capture of task completion may be appropriate to assess the efficiency of a website but would not be the chosen method to assess loyalty. A questionnaire or qualitative interview may be more appropriate for this attribute.

In the scenario of evaluating e-Bug, a questionnaire before browsing the website would be appropriate to rank the importance of the selected website attributes, chosen in step 1. It would then be appropriate to observe browsing of the website, collecting data on completion of typical task scenarios, using the screen capture function for future reference. This method could be used to evaluate the effectiveness (number of tasks successfully completed), efficiency (whether the most direct route through the website was used to complete the task), and learnability (whether task completion is more efficient or effective second time of trying). It may then be suitable to use a follow-up questionnaire to rate e-Bug against the website attributes previously ranked. The attribute ranking and rating could then be combined to indicate where the website performs well and areas for improvement.

Step 3: Who Should Evaluate the Website?

Both users and experts can be used to evaluate websites. Experts are able to identify areas for improvements, in relation to usability; whereas, users are able to appraise quality as well as identify areas for improvement. In this respect, users are able to fully evaluate user’s experience, where experts may not be able to.

For this reason, it may be more appropriate to use current or potential users of the website for the scenario of evaluating e-Bug.

Step 4: What Setting Should Be Used?

A combination of controlled and remote settings can be used, depending on the methods chosen. For example, it may be appropriate to collect data via a questionnaire, remotely, to increase sample size and reach a more diverse audience, whereas a controlled setting may be more appropriate for task completion using eye-tracking methods.

Strengths and Limitations

A scoping study differs from a systematic review, in that it does not critically appraise the quality of the studies before extracting or charting the data. Therefore, this study cannot compare the effectiveness of the different methods or methodologies in evaluating the website attributes. However, what it does do is review and summarize a huge amount of literature, from different sources, in a format that is understandable and informative for future designs of website evaluations.

Furthermore, studies that evaluate banking, e-commerce, or online libraries’ websites and do not have transferrable measures to a range of other websites were excluded from this study. This decision was made to limit the number of studies that met the remaining inclusion criteria, and it was deemed that the website attributes for these websites would be too specialist and not necessarily transferable to a range of websites. Therefore, the findings of this study may not be generalizable to all types of website. However, Multimedia Appendix 1 shows that data were extracted from a very broad range of websites when it was deemed that the information was transferrable to a range of other websites.

A robust website evaluation can identify areas for improvement to both fulfill the goals and desires of its users [ 62 ] and influence their perception of the organization and overall quality of resources [ 48 ]. An improved website could attract and retain more online users; therefore, an evidence-based website evaluation guide is essential.

Conclusions

This scoping study emphasizes the fact that the debate about how to define the quality of websites remains open, and there are numerous approaches and models to evaluate it. Multimedia Appendix 2 shows existing methodologies or tools that can be used to evaluate websites. Many of these are variations of similar approaches; therefore, it is not strictly necessary to use these tools at face value; however, some could be used to guide analysis, following data collection. By following steps 1 to 4 of GoodWeb, the framework suggested in this study, taking into account the desired participants and setting and website evaluation methods, can be tailored to the needs of specific websites and individual aims of evaluations.

Acknowledgments

This work was supported by the Primary Care Unit, Public Health England. This study is not applicable as secondary research.

Authors' Contributions

RA wrote the protocol with input from CH, CM, and VY. RA and CH conducted the scoping review. RA wrote the final manuscript with input from CH, CM, and VY. All authors reviewed and approved the final manuscript.

Conflicts of Interest

None declared.

Summary of included studies, including information on the participant.

Interventions: methodologies and tools to evaluate websites.

Methods used or described in each study.

Summary of the most used website attributes evaluated.

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Abbreviations

Edited by G Eysenbach; submitted 26.04.19; peer-reviewed by C Eley, C Brown; comments to author 31.05.19; revised version received 24.06.19; accepted 18.08.19; published 24.10.19

©Rosalie Allison, Catherine Hayes, Cliodna A M McNulty, Vicki Young. Originally published in JMIR Formative Research (http://formative.jmir.org), 24.10.2019.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR Formative Research, is properly cited. The complete bibliographic information, a link to the original publication on http://formative.jmir.org, as well as this copyright and license information must be included.

Literature review: your definitive guide

literature review website development

Joanna Wilkinson

This is our ultimate guide on how to write a narrative literature review. It forms part of our Research Smarter series . 

How do you write a narrative literature review?

Researchers worldwide are increasingly reliant on literature reviews. That’s because review articles provide you with a broad picture of the field, and help to synthesize published research that’s expanding at a rapid pace .

In some academic fields, researchers publish more literature reviews than original research papers. The graph below shows the substantial growth of narrative literature reviews in the Web of Science™, alongside the percentage increase of reviews when compared to all document types.

literature review website development

It’s critical that researchers across all career levels understand how to produce an objective, critical summary of published research. This is no easy feat, but a necessary one. Professionally constructed literature reviews – whether written by a student in class or an experienced researcher for publication – should aim to add to the literature rather than detract from it.

To help you write a narrative literature review, we’ve put together some top tips in this blog post.

Best practice tips to write a narrative literature review:

  • Don’t miss a paper: tips for a thorough topic search
  • Identify key papers (and know how to use them)
  • Tips for working with co-authors
  • Find the right journal for your literature review using actual data
  • Discover literature review examples and templates

We’ll also provide an overview of all the products helpful for your next narrative review, including the Web of Science, EndNote™ and Journal Citation Reports™.

1. Don’t miss a paper: tips for a thorough topic search

Once you’ve settled on your research question, coming up with a good set of keywords to find papers on your topic can be daunting. This isn’t surprising. Put simply, if you fail to include a relevant paper when you write a narrative literature review, the omission will probably get picked up by your professor or peer reviewers. The end result will likely be a low mark or an unpublished manuscript, neither of which will do justice to your many months of hard work.

Research databases and search engines are an integral part of any literature search. It’s important you utilize as many options available through your library as possible. This will help you search an entire discipline (as well as across disciplines) for a thorough narrative review.

We provide a short summary of the various databases and search engines in an earlier Research Smarter blog . These include the Web of Science , Science.gov and the Directory of Open Access Journals (DOAJ).

Like what you see? Share it with others on Twitter:

[bctt tweet=”Writing a #LiteratureReview? Check out the latest @clarivateAG blog for top tips (from topic searches to working with coauthors), examples, templates and more”]

Searching the Web of Science

The Web of Science is a multidisciplinary research engine that contains over 170 million papers from more than 250 academic disciplines. All of the papers in the database are interconnected via citations. That means once you get started with your keyword search, you can follow the trail of cited and citing papers to efficiently find all the relevant literature. This is a great way to ensure you’re not missing anything important when you write a narrative literature review.

We recommend starting your search in the Web of Science Core Collection™. This database covers more than 21,000 carefully selected journals. It is a trusted source to find research papers, and discover top authors and journals (read more about its coverage here ).

Learn more about exploring the Core Collection in our blog, How to find research papers: five tips every researcher should know . Our blog covers various tips, including how to:

  • Perform a topic search (and select your keywords)
  • Explore the citation network
  • Refine your results (refining your search results by reviews, for example, will help you avoid duplication of work, as well as identify trends and gaps in the literature)
  • Save your search and set up email alerts

Try our tips on the Web of Science now.

2. Identify key papers (and know how to use them)

As you explore the Web of Science, you may notice that certain papers are marked as “Highly Cited.” These papers can play a significant role when you write a narrative literature review.

Highly Cited papers are recently published papers getting the most attention in your field right now. They form the top 1% of papers based on the number of citations received, compared to other papers published in the same field in the same year.

You will want to identify Highly Cited research as a group of papers. This group will help guide your analysis of the future of the field and opportunities for future research. This is an important component of your conclusion.

Writing reviews is hard work…[it] not only organizes published papers, but also positions t hem in the academic process and presents the future direction.   Prof. Susumu Kitagawa, Highly Cited Researcher, Kyoto University

3. Tips for working with co-authors

Writing a narrative review on your own is hard, but it can be even more challenging if you’re collaborating with a team, especially if your coauthors are working across multiple locations. Luckily, reference management software can improve the coordination between you and your co-authors—both around the department and around the world.

We’ve written about how to use EndNote’s Cite While You Write feature, which will help you save hundreds of hours when writing research . Here, we discuss the features that give you greater ease and control when collaborating with your colleagues.

Use EndNote for narrative reviews

Sharing references is essential for successful collaboration. With EndNote, you can store and share as many references, documents and files as you need with up to 100 people using the software.

You can share simultaneous access to one reference library, regardless of your colleague’s location or organization. You can also choose the type of access each user has on an individual basis. For example, Read-Write access means a select colleague can add and delete references, annotate PDF articles and create custom groups. They’ll also be able to see up to 500 of the team’s most recent changes to the reference library. Read-only is also an option for individuals who don’t need that level of access.

EndNote helps you overcome research limitations by synchronizing library changes every 15 minutes. That means your team can stay up-to-date at any time of the day, supporting an easier, more successful collaboration.

Start your free EndNote trial today .

4.Finding a journal for your literature review

Finding the right journal for your literature review can be a particular pain point for those of you who want to publish. The expansion of scholarly journals has made the task extremely difficult, and can potentially delay the publication of your work by many months.

We’ve written a blog about how you can find the right journal for your manuscript using a rich array of data. You can read our blog here , or head straight to Endnote’s Manuscript Matcher or Journal Citation Report s to try out the best tools for the job.

5. Discover literature review examples and templates

There are a few tips we haven’t covered in this blog, including how to decide on an area of research, develop an interesting storyline, and highlight gaps in the literature. We’ve listed a few blogs here that might help you with this, alongside some literature review examples and outlines to get you started.

Literature Review examples:

  • Aggregation-induced emission
  • Development and applications of CRISPR-Cas9 for genome engineering
  • Object based image analysis for remote sensing

(Make sure you download the free EndNote™ Click browser plugin to access the full-text PDFs).

Templates and outlines:

  • Learn how to write a review of literature , Univ. of Wisconsin – Madison
  • Structuring a literature review , Australian National University
  • Matrix Method for Literature Review: The Review Matrix , Duquesne University

Additional resources:

  • Ten simple rules for writing a literature review , Editor, PLoS Computational Biology
  • Video: How to write a literature review , UC San Diego Psychology

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How To Write An A-Grade Literature Review

3 straightforward steps (with examples) + free template.

By: Derek Jansen (MBA) | Expert Reviewed By: Dr. Eunice Rautenbach | October 2019

Quality research is about building onto the existing work of others , “standing on the shoulders of giants”, as Newton put it. The literature review chapter of your dissertation, thesis or research project is where you synthesise this prior work and lay the theoretical foundation for your own research.

Long story short, this chapter is a pretty big deal, which is why you want to make sure you get it right . In this post, I’ll show you exactly how to write a literature review in three straightforward steps, so you can conquer this vital chapter (the smart way).

Overview: The Literature Review Process

  • Understanding the “ why “
  • Finding the relevant literature
  • Cataloguing and synthesising the information
  • Outlining & writing up your literature review
  • Example of a literature review

But first, the “why”…

Before we unpack how to write the literature review chapter, we’ve got to look at the why . To put it bluntly, if you don’t understand the function and purpose of the literature review process, there’s no way you can pull it off well. So, what exactly is the purpose of the literature review?

Well, there are (at least) four core functions:

  • For you to gain an understanding (and demonstrate this understanding) of where the research is at currently, what the key arguments and disagreements are.
  • For you to identify the gap(s) in the literature and then use this as justification for your own research topic.
  • To help you build a conceptual framework for empirical testing (if applicable to your research topic).
  • To inform your methodological choices and help you source tried and tested questionnaires (for interviews ) and measurement instruments (for surveys ).

Most students understand the first point but don’t give any thought to the rest. To get the most from the literature review process, you must keep all four points front of mind as you review the literature (more on this shortly), or you’ll land up with a wonky foundation.

Okay – with the why out the way, let’s move on to the how . As mentioned above, writing your literature review is a process, which I’ll break down into three steps:

  • Finding the most suitable literature
  • Understanding , distilling and organising the literature
  • Planning and writing up your literature review chapter

Importantly, you must complete steps one and two before you start writing up your chapter. I know it’s very tempting, but don’t try to kill two birds with one stone and write as you read. You’ll invariably end up wasting huge amounts of time re-writing and re-shaping, or you’ll just land up with a disjointed, hard-to-digest mess . Instead, you need to read first and distil the information, then plan and execute the writing.

Free Webinar: Literature Review 101

Step 1: Find the relevant literature

Naturally, the first step in the literature review journey is to hunt down the existing research that’s relevant to your topic. While you probably already have a decent base of this from your research proposal , you need to expand on this substantially in the dissertation or thesis itself.

Essentially, you need to be looking for any existing literature that potentially helps you answer your research question (or develop it, if that’s not yet pinned down). There are numerous ways to find relevant literature, but I’ll cover my top four tactics here. I’d suggest combining all four methods to ensure that nothing slips past you:

Method 1 – Google Scholar Scrubbing

Google’s academic search engine, Google Scholar , is a great starting point as it provides a good high-level view of the relevant journal articles for whatever keyword you throw at it. Most valuably, it tells you how many times each article has been cited, which gives you an idea of how credible (or at least, popular) it is. Some articles will be free to access, while others will require an account, which brings us to the next method.

Method 2 – University Database Scrounging

Generally, universities provide students with access to an online library, which provides access to many (but not all) of the major journals.

So, if you find an article using Google Scholar that requires paid access (which is quite likely), search for that article in your university’s database – if it’s listed there, you’ll have access. Note that, generally, the search engine capabilities of these databases are poor, so make sure you search for the exact article name, or you might not find it.

Method 3 – Journal Article Snowballing

At the end of every academic journal article, you’ll find a list of references. As with any academic writing, these references are the building blocks of the article, so if the article is relevant to your topic, there’s a good chance a portion of the referenced works will be too. Do a quick scan of the titles and see what seems relevant, then search for the relevant ones in your university’s database.

Method 4 – Dissertation Scavenging

Similar to Method 3 above, you can leverage other students’ dissertations. All you have to do is skim through literature review chapters of existing dissertations related to your topic and you’ll find a gold mine of potential literature. Usually, your university will provide you with access to previous students’ dissertations, but you can also find a much larger selection in the following databases:

  • Open Access Theses & Dissertations
  • Stanford SearchWorks

Keep in mind that dissertations and theses are not as academically sound as published, peer-reviewed journal articles (because they’re written by students, not professionals), so be sure to check the credibility of any sources you find using this method. You can do this by assessing the citation count of any given article in Google Scholar. If you need help with assessing the credibility of any article, or with finding relevant research in general, you can chat with one of our Research Specialists .

Alright – with a good base of literature firmly under your belt, it’s time to move onto the next step.

Need a helping hand?

literature review website development

Step 2: Log, catalogue and synthesise

Once you’ve built a little treasure trove of articles, it’s time to get reading and start digesting the information – what does it all mean?

While I present steps one and two (hunting and digesting) as sequential, in reality, it’s more of a back-and-forth tango – you’ll read a little , then have an idea, spot a new citation, or a new potential variable, and then go back to searching for articles. This is perfectly natural – through the reading process, your thoughts will develop , new avenues might crop up, and directional adjustments might arise. This is, after all, one of the main purposes of the literature review process (i.e. to familiarise yourself with the current state of research in your field).

As you’re working through your treasure chest, it’s essential that you simultaneously start organising the information. There are three aspects to this:

  • Logging reference information
  • Building an organised catalogue
  • Distilling and synthesising the information

I’ll discuss each of these below:

2.1 – Log the reference information

As you read each article, you should add it to your reference management software. I usually recommend Mendeley for this purpose (see the Mendeley 101 video below), but you can use whichever software you’re comfortable with. Most importantly, make sure you load EVERY article you read into your reference manager, even if it doesn’t seem very relevant at the time.

2.2 – Build an organised catalogue

In the beginning, you might feel confident that you can remember who said what, where, and what their main arguments were. Trust me, you won’t. If you do a thorough review of the relevant literature (as you must!), you’re going to read many, many articles, and it’s simply impossible to remember who said what, when, and in what context . Also, without the bird’s eye view that a catalogue provides, you’ll miss connections between various articles, and have no view of how the research developed over time. Simply put, it’s essential to build your own catalogue of the literature.

I would suggest using Excel to build your catalogue, as it allows you to run filters, colour code and sort – all very useful when your list grows large (which it will). How you lay your spreadsheet out is up to you, but I’d suggest you have the following columns (at minimum):

  • Author, date, title – Start with three columns containing this core information. This will make it easy for you to search for titles with certain words, order research by date, or group by author.
  • Categories or keywords – You can either create multiple columns, one for each category/theme and then tick the relevant categories, or you can have one column with keywords.
  • Key arguments/points – Use this column to succinctly convey the essence of the article, the key arguments and implications thereof for your research.
  • Context – Note the socioeconomic context in which the research was undertaken. For example, US-based, respondents aged 25-35, lower- income, etc. This will be useful for making an argument about gaps in the research.
  • Methodology – Note which methodology was used and why. Also, note any issues you feel arise due to the methodology. Again, you can use this to make an argument about gaps in the research.
  • Quotations – Note down any quoteworthy lines you feel might be useful later.
  • Notes – Make notes about anything not already covered. For example, linkages to or disagreements with other theories, questions raised but unanswered, shortcomings or limitations, and so forth.

If you’d like, you can try out our free catalog template here (see screenshot below).

Excel literature review template

2.3 – Digest and synthesise

Most importantly, as you work through the literature and build your catalogue, you need to synthesise all the information in your own mind – how does it all fit together? Look for links between the various articles and try to develop a bigger picture view of the state of the research. Some important questions to ask yourself are:

  • What answers does the existing research provide to my own research questions ?
  • Which points do the researchers agree (and disagree) on?
  • How has the research developed over time?
  • Where do the gaps in the current research lie?

To help you develop a big-picture view and synthesise all the information, you might find mind mapping software such as Freemind useful. Alternatively, if you’re a fan of physical note-taking, investing in a large whiteboard might work for you.

Mind mapping is a useful way to plan your literature review.

Step 3: Outline and write it up!

Once you’re satisfied that you have digested and distilled all the relevant literature in your mind, it’s time to put pen to paper (or rather, fingers to keyboard). There are two steps here – outlining and writing:

3.1 – Draw up your outline

Having spent so much time reading, it might be tempting to just start writing up without a clear structure in mind. However, it’s critically important to decide on your structure and develop a detailed outline before you write anything. Your literature review chapter needs to present a clear, logical and an easy to follow narrative – and that requires some planning. Don’t try to wing it!

Naturally, you won’t always follow the plan to the letter, but without a detailed outline, you’re more than likely going to end up with a disjointed pile of waffle , and then you’re going to spend a far greater amount of time re-writing, hacking and patching. The adage, “measure twice, cut once” is very suitable here.

In terms of structure, the first decision you’ll have to make is whether you’ll lay out your review thematically (into themes) or chronologically (by date/period). The right choice depends on your topic, research objectives and research questions, which we discuss in this article .

Once that’s decided, you need to draw up an outline of your entire chapter in bullet point format. Try to get as detailed as possible, so that you know exactly what you’ll cover where, how each section will connect to the next, and how your entire argument will develop throughout the chapter. Also, at this stage, it’s a good idea to allocate rough word count limits for each section, so that you can identify word count problems before you’ve spent weeks or months writing!

PS – check out our free literature review chapter template…

3.2 – Get writing

With a detailed outline at your side, it’s time to start writing up (finally!). At this stage, it’s common to feel a bit of writer’s block and find yourself procrastinating under the pressure of finally having to put something on paper. To help with this, remember that the objective of the first draft is not perfection – it’s simply to get your thoughts out of your head and onto paper, after which you can refine them. The structure might change a little, the word count allocations might shift and shuffle, and you might add or remove a section – that’s all okay. Don’t worry about all this on your first draft – just get your thoughts down on paper.

start writing

Once you’ve got a full first draft (however rough it may be), step away from it for a day or two (longer if you can) and then come back at it with fresh eyes. Pay particular attention to the flow and narrative – does it fall fit together and flow from one section to another smoothly? Now’s the time to try to improve the linkage from each section to the next, tighten up the writing to be more concise, trim down word count and sand it down into a more digestible read.

Once you’ve done that, give your writing to a friend or colleague who is not a subject matter expert and ask them if they understand the overall discussion. The best way to assess this is to ask them to explain the chapter back to you. This technique will give you a strong indication of which points were clearly communicated and which weren’t. If you’re working with Grad Coach, this is a good time to have your Research Specialist review your chapter.

Finally, tighten it up and send it off to your supervisor for comment. Some might argue that you should be sending your work to your supervisor sooner than this (indeed your university might formally require this), but in my experience, supervisors are extremely short on time (and often patience), so, the more refined your chapter is, the less time they’ll waste on addressing basic issues (which you know about already) and the more time they’ll spend on valuable feedback that will increase your mark-earning potential.

Literature Review Example

In the video below, we unpack an actual literature review so that you can see how all the core components come together in reality.

Let’s Recap

In this post, we’ve covered how to research and write up a high-quality literature review chapter. Let’s do a quick recap of the key takeaways:

  • It is essential to understand the WHY of the literature review before you read or write anything. Make sure you understand the 4 core functions of the process.
  • The first step is to hunt down the relevant literature . You can do this using Google Scholar, your university database, the snowballing technique and by reviewing other dissertations and theses.
  • Next, you need to log all the articles in your reference manager , build your own catalogue of literature and synthesise all the research.
  • Following that, you need to develop a detailed outline of your entire chapter – the more detail the better. Don’t start writing without a clear outline (on paper, not in your head!)
  • Write up your first draft in rough form – don’t aim for perfection. Remember, done beats perfect.
  • Refine your second draft and get a layman’s perspective on it . Then tighten it up and submit it to your supervisor.

Literature Review Course

Psst… there’s more!

This post is an extract from our bestselling short course, Literature Review Bootcamp . If you want to work smart, you don't want to miss this .

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How To Find a Research Gap (Fast)

38 Comments

Phindile Mpetshwa

Thank you very much. This page is an eye opener and easy to comprehend.

Yinka

This is awesome!

I wish I come across GradCoach earlier enough.

But all the same I’ll make use of this opportunity to the fullest.

Thank you for this good job.

Keep it up!

Derek Jansen

You’re welcome, Yinka. Thank you for the kind words. All the best writing your literature review.

Renee Buerger

Thank you for a very useful literature review session. Although I am doing most of the steps…it being my first masters an Mphil is a self study and one not sure you are on the right track. I have an amazing supervisor but one also knows they are super busy. So not wanting to bother on the minutae. Thank you.

You’re most welcome, Renee. Good luck with your literature review 🙂

Sheemal Prasad

This has been really helpful. Will make full use of it. 🙂

Thank you Gradcoach.

Tahir

Really agreed. Admirable effort

Faturoti Toyin

thank you for this beautiful well explained recap.

Tara

Thank you so much for your guide of video and other instructions for the dissertation writing.

It is instrumental. It encouraged me to write a dissertation now.

Lorraine Hall

Thank you the video was great – from someone that knows nothing thankyou

araz agha

an amazing and very constructive way of presetting a topic, very useful, thanks for the effort,

Suilabayuh Ngah

It is timely

It is very good video of guidance for writing a research proposal and a dissertation. Since I have been watching and reading instructions, I have started my research proposal to write. I appreciate to Mr Jansen hugely.

Nancy Geregl

I learn a lot from your videos. Very comprehensive and detailed.

Thank you for sharing your knowledge. As a research student, you learn better with your learning tips in research

Uzma

I was really stuck in reading and gathering information but after watching these things are cleared thanks, it is so helpful.

Xaysukith thorxaitou

Really helpful, Thank you for the effort in showing such information

Sheila Jerome

This is super helpful thank you very much.

Mary

Thank you for this whole literature writing review.You have simplified the process.

Maithe

I’m so glad I found GradCoach. Excellent information, Clear explanation, and Easy to follow, Many thanks Derek!

You’re welcome, Maithe. Good luck writing your literature review 🙂

Anthony

Thank you Coach, you have greatly enriched and improved my knowledge

Eunice

Great piece, so enriching and it is going to help me a great lot in my project and thesis, thanks so much

Stephanie Louw

This is THE BEST site for ANYONE doing a masters or doctorate! Thank you for the sound advice and templates. You rock!

Thanks, Stephanie 🙂

oghenekaro Silas

This is mind blowing, the detailed explanation and simplicity is perfect.

I am doing two papers on my final year thesis, and I must stay I feel very confident to face both headlong after reading this article.

thank you so much.

if anyone is to get a paper done on time and in the best way possible, GRADCOACH is certainly the go to area!

tarandeep singh

This is very good video which is well explained with detailed explanation

uku igeny

Thank you excellent piece of work and great mentoring

Abdul Ahmad Zazay

Thanks, it was useful

Maserialong Dlamini

Thank you very much. the video and the information were very helpful.

Suleiman Abubakar

Good morning scholar. I’m delighted coming to know you even before the commencement of my dissertation which hopefully is expected in not more than six months from now. I would love to engage my study under your guidance from the beginning to the end. I love to know how to do good job

Mthuthuzeli Vongo

Thank you so much Derek for such useful information on writing up a good literature review. I am at a stage where I need to start writing my one. My proposal was accepted late last year but I honestly did not know where to start

SEID YIMAM MOHAMMED (Technic)

Like the name of your YouTube implies you are GRAD (great,resource person, about dissertation). In short you are smart enough in coaching research work.

Richie Buffalo

This is a very well thought out webpage. Very informative and a great read.

Adekoya Opeyemi Jonathan

Very timely.

I appreciate.

Norasyidah Mohd Yusoff

Very comprehensive and eye opener for me as beginner in postgraduate study. Well explained and easy to understand. Appreciate and good reference in guiding me in my research journey. Thank you

Maryellen Elizabeth Hart

Thank you. I requested to download the free literature review template, however, your website wouldn’t allow me to complete the request or complete a download. May I request that you email me the free template? Thank you.

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The Literature Review

What Is a Literature Review? According to the seventh edition of the APA Publication Manual, a literature review is "a critical evaluation of material that has already been published."  As one embarks on creating a literature review, it is important to note that the grouping of components within a literature review can be arranged according to the author's discretion.  However, it is important for the author to ensure the review reflects current APA publication standards.

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Writing a Literature Review

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A literature review is a document or section of a document that collects key sources on a topic and discusses those sources in conversation with each other (also called synthesis ). The lit review is an important genre in many disciplines, not just literature (i.e., the study of works of literature such as novels and plays). When we say “literature review” or refer to “the literature,” we are talking about the research ( scholarship ) in a given field. You will often see the terms “the research,” “the scholarship,” and “the literature” used mostly interchangeably.

Where, when, and why would I write a lit review?

There are a number of different situations where you might write a literature review, each with slightly different expectations; different disciplines, too, have field-specific expectations for what a literature review is and does. For instance, in the humanities, authors might include more overt argumentation and interpretation of source material in their literature reviews, whereas in the sciences, authors are more likely to report study designs and results in their literature reviews; these differences reflect these disciplines’ purposes and conventions in scholarship. You should always look at examples from your own discipline and talk to professors or mentors in your field to be sure you understand your discipline’s conventions, for literature reviews as well as for any other genre.

A literature review can be a part of a research paper or scholarly article, usually falling after the introduction and before the research methods sections. In these cases, the lit review just needs to cover scholarship that is important to the issue you are writing about; sometimes it will also cover key sources that informed your research methodology.

Lit reviews can also be standalone pieces, either as assignments in a class or as publications. In a class, a lit review may be assigned to help students familiarize themselves with a topic and with scholarship in their field, get an idea of the other researchers working on the topic they’re interested in, find gaps in existing research in order to propose new projects, and/or develop a theoretical framework and methodology for later research. As a publication, a lit review usually is meant to help make other scholars’ lives easier by collecting and summarizing, synthesizing, and analyzing existing research on a topic. This can be especially helpful for students or scholars getting into a new research area, or for directing an entire community of scholars toward questions that have not yet been answered.

What are the parts of a lit review?

Most lit reviews use a basic introduction-body-conclusion structure; if your lit review is part of a larger paper, the introduction and conclusion pieces may be just a few sentences while you focus most of your attention on the body. If your lit review is a standalone piece, the introduction and conclusion take up more space and give you a place to discuss your goals, research methods, and conclusions separately from where you discuss the literature itself.

Introduction:

  • An introductory paragraph that explains what your working topic and thesis is
  • A forecast of key topics or texts that will appear in the review
  • Potentially, a description of how you found sources and how you analyzed them for inclusion and discussion in the review (more often found in published, standalone literature reviews than in lit review sections in an article or research paper)
  • Summarize and synthesize: Give an overview of the main points of each source and combine them into a coherent whole
  • Analyze and interpret: Don’t just paraphrase other researchers – add your own interpretations where possible, discussing the significance of findings in relation to the literature as a whole
  • Critically Evaluate: Mention the strengths and weaknesses of your sources
  • Write in well-structured paragraphs: Use transition words and topic sentence to draw connections, comparisons, and contrasts.

Conclusion:

  • Summarize the key findings you have taken from the literature and emphasize their significance
  • Connect it back to your primary research question

How should I organize my lit review?

Lit reviews can take many different organizational patterns depending on what you are trying to accomplish with the review. Here are some examples:

  • Chronological : The simplest approach is to trace the development of the topic over time, which helps familiarize the audience with the topic (for instance if you are introducing something that is not commonly known in your field). If you choose this strategy, be careful to avoid simply listing and summarizing sources in order. Try to analyze the patterns, turning points, and key debates that have shaped the direction of the field. Give your interpretation of how and why certain developments occurred (as mentioned previously, this may not be appropriate in your discipline — check with a teacher or mentor if you’re unsure).
  • Thematic : If you have found some recurring central themes that you will continue working with throughout your piece, you can organize your literature review into subsections that address different aspects of the topic. For example, if you are reviewing literature about women and religion, key themes can include the role of women in churches and the religious attitude towards women.
  • Qualitative versus quantitative research
  • Empirical versus theoretical scholarship
  • Divide the research by sociological, historical, or cultural sources
  • Theoretical : In many humanities articles, the literature review is the foundation for the theoretical framework. You can use it to discuss various theories, models, and definitions of key concepts. You can argue for the relevance of a specific theoretical approach or combine various theorical concepts to create a framework for your research.

What are some strategies or tips I can use while writing my lit review?

Any lit review is only as good as the research it discusses; make sure your sources are well-chosen and your research is thorough. Don’t be afraid to do more research if you discover a new thread as you’re writing. More info on the research process is available in our "Conducting Research" resources .

As you’re doing your research, create an annotated bibliography ( see our page on the this type of document ). Much of the information used in an annotated bibliography can be used also in a literature review, so you’ll be not only partially drafting your lit review as you research, but also developing your sense of the larger conversation going on among scholars, professionals, and any other stakeholders in your topic.

Usually you will need to synthesize research rather than just summarizing it. This means drawing connections between sources to create a picture of the scholarly conversation on a topic over time. Many student writers struggle to synthesize because they feel they don’t have anything to add to the scholars they are citing; here are some strategies to help you:

  • It often helps to remember that the point of these kinds of syntheses is to show your readers how you understand your research, to help them read the rest of your paper.
  • Writing teachers often say synthesis is like hosting a dinner party: imagine all your sources are together in a room, discussing your topic. What are they saying to each other?
  • Look at the in-text citations in each paragraph. Are you citing just one source for each paragraph? This usually indicates summary only. When you have multiple sources cited in a paragraph, you are more likely to be synthesizing them (not always, but often
  • Read more about synthesis here.

The most interesting literature reviews are often written as arguments (again, as mentioned at the beginning of the page, this is discipline-specific and doesn’t work for all situations). Often, the literature review is where you can establish your research as filling a particular gap or as relevant in a particular way. You have some chance to do this in your introduction in an article, but the literature review section gives a more extended opportunity to establish the conversation in the way you would like your readers to see it. You can choose the intellectual lineage you would like to be part of and whose definitions matter most to your thinking (mostly humanities-specific, but this goes for sciences as well). In addressing these points, you argue for your place in the conversation, which tends to make the lit review more compelling than a simple reporting of other sources.

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  • Open access
  • Published: 20 May 2024

Targeted temperature control following traumatic brain injury: ESICM/NACCS best practice consensus recommendations

  • Andrea Lavinio 1 , 2 ,
  • Jonathan P. Coles 1 , 2 ,
  • Chiara Robba 3 ,
  • Marcel Aries 4 , 5 ,
  • Pierre Bouzat 6 ,
  • Dara Chean 7 ,
  • Shirin Frisvold 8 , 9 ,
  • Laura Galarza 10 ,
  • Raimund Helbok 11 , 12 ,
  • Jeroen Hermanides 13 ,
  • Mathieu van der Jagt 14 ,
  • David K. Menon 1 , 2 ,
  • Geert Meyfroidt 15 ,
  • Jean-Francois Payen 6 ,
  • Daniele Poole 16 ,
  • Frank Rasulo 17 ,
  • Jonathan Rhodes 18 ,
  • Emily Sidlow 19 ,
  • Luzius A. Steiner 20 ,
  • Fabio Silvio Taccone 21 , 22 &
  • Riikka Takala 23 , 24  

Critical Care volume  28 , Article number:  170 ( 2024 ) Cite this article

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Aims and scope

The aim of this panel was to develop consensus recommendations on targeted temperature control (TTC) in patients with severe traumatic brain injury (TBI) and in patients with moderate TBI who deteriorate and require admission to the intensive care unit for intracranial pressure (ICP) management.

A group of 18 international neuro-intensive care experts in the acute management of TBI participated in a modified Delphi process. An online anonymised survey based on a systematic literature review was completed ahead of the meeting, before the group convened to explore the level of consensus on TTC following TBI. Outputs from the meeting were combined into a further anonymous online survey round to finalise recommendations. Thresholds of ≥ 16 out of 18 panel members in agreement (≥ 88%) for strong consensus and ≥ 14 out of 18 (≥ 78%) for moderate consensus were prospectively set for all statements.

Strong consensus was reached on TTC being essential for high-quality TBI care. It was recommended that temperature should be monitored continuously, and that fever should be promptly identified and managed in patients perceived to be at risk of secondary brain injury. Controlled normothermia (36.0–37.5 °C) was strongly recommended as a therapeutic option to be considered in tier 1 and 2 of the Seattle International Severe Traumatic Brain Injury Consensus Conference ICP management protocol. Temperature control targets should be individualised based on the perceived risk of secondary brain injury and fever aetiology.

Conclusions

Based on a modified Delphi expert consensus process, this report aims to inform on best practices for TTC delivery for patients following TBI, and to highlight areas of need for further research to improve clinical guidelines in this setting.

Introduction

Traumatic brain injury (TBI) is a complex and heterogeneous disease, and a major cause of death and disability globally [ 1 , 2 , 3 ]. Amongst other common neurological diseases, TBI is estimated to have the highest prevalence and incidence, impacting up to 60 million people worldwide annually and representing a substantial public health burden [ 4 ].

TBI is defined as an alteration in brain function or other evidence of brain pathology caused by an external force [ 5 ], and requires immediate and sustained management strategies to optimise clinical outcome. The injury processes that follow from a TBI are divided into two stages: primary and secondary [ 6 ], where primary injury refers to the damage caused by the original physical impact, which can trigger a pathophysiological cascade resulting in secondary injury with deleterious effects on neurological outcome and survival [ 7 , 8 ]. In order to prevent or mitigate secondary injury, immediate treatment following severe TBI focuses on the prevention of further brain damage. As the brain remains susceptible to secondary injury from processes that extend beyond the zone of primary injury such as ischaemia, oedema, herniation, seizures and altered metabolism [ 9 ], immediate treatment following severe TBI focuses on prevention or mitigation of such injury. This is achieved through the control of intracranial pressure (ICP), and prompt treatment of systemic insults such as hypoxia, hypercapnia, and systemic hypotension [ 10 ].

In the neuro-intensive care unit (NICU), fever is a prevalent occurrence with heterogenous underlying causes, and it may contribute to secondary injury. Across patients with TBI, subarachnoid haemorrhage and stroke [ 11 , 12 , 13 ], hyperthermia has been found to increase the risk of complications and is believed to be associated with unfavourable clinical outcome including death [ 9 , 11 , 14 , 15 ].

Targeted temperature control (TTC) is a complex intervention that aims to control body or brain temperature to prevent further brain injury and improve neurological outcome [ 9 ]. The term TTC may refer to different degrees of temperature control, from fever prevention, maintenance of normothermia to the induction of hypothermia, at different levels [ 9 , 16 ]. In TBI, TTC can be used to modulate a range of important physiological parameters such as cerebral metabolism and ICP. However, its role in improving long-term outcome, as well as the appropriate indications, targets and duration of TTC in severe or moderate TBI are currently unknown.

This work aims to utilise a Delphi approach to develop best-practice consensus recommendations from international experts for the real-world application of TTC in severe TBI with ICP guided treatments.

Review of the literature and evidence quality assessment

Statements and questions were informed by a systematic review of the literature, which identified observational studies, meta-analyses and randomised controlled trials (RCTs) relevant to the topics under discussion. This review search focused on evidence released since 2013. Following this first review, the methodology group of ESICM conducted an independent systematic review of the literature, considering only published RCTs regarding TTC in TBI patients with ICP monitoring. This review confirmed the paucity of RCTs and the substantial clinical heterogeneity between them, which precluded meta-analytical combination. The outputs from the reviews were shared with the expert panel members ahead of the Delphi process. A detailed reporting of the literature reviews is provided as Additional files 1 and 4 .

Participants

The 18 expert attendees for the Delphi process were chosen from members of three professional societies: the Neuro Anaesthesia and Critical Care Society (NACCS), the European Society of Intensive Care Medicine (ESICM), and the European Society of Anaesthesiology and Intensive Care (ESAIC). Selection was based on a documented history of publications in the fields of traumatic brain injury and/or targeted temperature management, as well as their established professional profiles and expertise as leading intensive care practitioners in teaching university hospitals. We endeavoured to ensure balanced representation, covering the geographic areas of the EU, Switzerland, and the UK.

Delphi rounds

A modified Delphi consensus method was employed, involving a combination of an online survey (Round 1), a face-to-face meeting (Round 2), an additional online survey containing the refined questions from the previous steps, (Round 3) and post-meeting reviews of the consensus results. The questions asked at Round 1 can be found in the Additional file 2 , and the results following Round 3 are shown in Table  1 . Round 1 was conducted via the SmartSurvey® online platform, and Round 2 was held as a hybrid meeting in London, UK, on Tuesday 10th October 2023. AL acted as Chair, with an independent facilitator (ES) moderating the meeting. After the results from the final survey of Round 3 were received, the recommendations and final manuscript were developed, with documents shared by e-mail and feedback collected independently from each participant by the facilitator. The predefined agreed cut-off for strong consensus was to have ≥ 16 out of 18 (≥ 88%) of panel members in agreement, and for moderate consensus was to have ≥ 14 out of 18 (≥ 78%) of panel members in agreement. The Delphi methodology and process was adopted from the manuscript published by Lavinio et al. [ 17 ]. In a Delphi process, conflicting opinions are addressed through a structured framework that promotes consensus-building among experts. Initially, participants are asked to provide their views anonymously, which are then summarised and shared with the group. This approach facilitates open and unbiased input, as the anonymity helps mitigate the influence of dominant personalities or hierarchical pressures. When conflicting opinions emerge, they are documented and presented back to the participants, along with any common ground that has been identified. In subsequent rounds, individuals are encouraged to reconsider their positions in light of the collective feedback, which often leads to a convergence of opinions. If discrepancies persist, these are explored through further iterative rounds, with an emphasis on clarifying rationale and seeking areas of agreement. The Delphi method's iterative nature, combined with the feedback mechanism, effectively manages conflicting opinions by fostering a gradual move towards consensus, or at least a clearer understanding of the points of divergence. The process for the Delphi panel and subsequent manuscript development is visualised in Fig.  1 . A detailed overview of the iterative Delphi process is provided in the Additional files 2 and 3 .

figure 1

Summary of the Delphi process. ESAIC European Society of Anaesthesiology and Intensive Care, ESICM European Society of Intensive Care Medicine, NACCS Neuro Anaesthesia and Critical Care Society

Definitions

To guide discussions during the Delphi process, clinical terms were defined with the values as shown below.

Declarations and conflicts of interest

The face-to face meeting in London was supported by Becton, Dickinson and Company (“BD”) through the provision of travel costs, meeting space and refreshments. Representatives from BD were allowed to silently observe the conference, without any interaction with the panellists or the process. No donors or other outside parties influenced any portion of these recommendations. There was no industry input into recommendation development, and no panel member received honoraria for their involvement. Panellists completed conflict of interest forms relevant to TBI management. There were no conflicts mandating recusal of any participant. No funding was provided by the societies involved.

The results of the final consensus are presented in Table  1 . We highlight and expand upon statements in which consensus was reached in the discussion section. Some consideration is added to statements in which consensus was not reached, proposing them as potential areas for valuable future research.

To date, there is a lack of definitive evidence regarding the use of TTC with an automated feedback-controlled device for managing temperature in severe TBI. This underlines the importance of consensus discussion in identifying areas of uncertainty where evidence is lacking, and in encouraging harmonised care delivery across different settings.

Pathophysiology

Temperature measurement and control is an essential aspect of high-quality care in patients with severe TBI

In patients with impending cerebral herniation, temperature control is essential

As an introduction to the discussions, the group debated the recommendation for temperature measurement and control following severe TBI and, after extensive discussion, concluded that core temperature measurement and control is essential for the provision of high-quality care, especially in patients perceived to be at high risk of secondary brain injury. Noting the phrasing of ‘temperature control’ in the recent guidelines for temperature control following cardiac arrest [ 18 ], the group agreed that as an entry point into high-quality care following TBI, the notion of temperature measurement and control is key, opening the door to the full practice of targeted temperature management. This nuanced phrasing was intended to set the scene for the group’s work, with the specifics of the TTC process such as temperature ranges and duration of control being addressed throughout the remainder of the discussions.

Highlighting the wealth of physiological data available on the management of temperature in stroke and cardiac arrest, the group noted that the guidelines for temperature management in TBI are less specific. Fundamentally, the group agreed that high-quality TBI care does include monitoring temperature and implementing some form of temperature control, recognising its potential role in optimising outcome. The group highlighted the importance of treatment titration based on an individualised risk–benefit assessment and stratification. In particular, it was noted that in patients with exhausted intracranial compensatory reserve and at risk of cerebral herniation or ischaemia—there exists an extreme susceptibility to secondary brain injury precipitated by suboptimal temperature control.

Cerebral herniation is a life-threatening event that requires early diagnosis and prompt management in order to prevent irreversible pathological cascades that can lead to death [ 19 ]. Increases in brain temperature have been linked to a linear rise in ICP, with the relationships between temperature, ICP and cerebral perfusion pressure (CPP) becoming more apparent with rapid temperature changes. The impact of temperature on ICP supports the recommendation from the group that temperature control is an essential aspect of care in patients at risk of herniation [ 20 ]. The group agreed that while control of ICP and prevention of herniation were important reasons for TTC in TBI, benefits of TTC in the acute phase of TBI also extended to patients without intracranial hypertension.

During the discussions the group highlighted that different pathologies often dictate different patient management. For example, patients in whom fluctuations in ICP are well-tolerated (e.g., patients with high intracranial compliance) will be managed differently to patients with obliterated basal cisterns, obliterated cortical sulci, and midline shift (e.g., intracranial mass effect). In patients with exhausted intracranial volume-buffering reserve, strict control of physiological parameters such as CO 2 and temperature, is strongly recommended.

Continuous temperature monitoring is preferable over intermittent temperature measurements in patients with severe TBI.

Monitoring core temperature (e.g., bladder, oesophageal, brain) is strongly recommended over measuring or monitoring superficial temperature (e.g., skin, tympanic) in severe TBI.

When brain temperature monitoring is in place, it is advisable to assess an additional source of core temperature monitoring (i.e. oesophageal, bladder).

The group widely agreed, in line with supporting literature, that continuous temperature monitoring is preferable over intermittent temperature measurements with severe TBI. Intermittent monitoring and recording of temperature can result in large fluctuations in temperature being missed, as highlighted by supporting literature investigating the use of TTC following cardiac arrest, TBI and stroke [ 17 , 21 , 22 ].

Discussions amongst the group drew attention to the fact that inaccurately measured temperatures can negatively impact patient care and outcome. Several temperature monitoring sites are available for TTC, and the group widely agreed that core temperature measurements, i.e., bladder and oesophageal sites, are strongly preferred over superficial measurements such as those taken at skin and tympanic sites. Following acknowledgement of their limitations [ 23 ], bladder and oesophageal were singled out as favoured core temperature measurements. The group acknowledged the widespread use of oesophageal probes due to their relative ease of insertion and the challenges of finding MRI compatible bladder probes. Confirmation of preference between the two was acknowledged as being beyond the scope of the group due to these nuances. Rectal temperature monitoring was widely regarded as impractical for reasons such as the lag time and a high rate of dislocation [ 16 , 23 ]. Peripheral sites were unanimously deemed to be insufficiently accurate to guide temperature treatment [ 16 ].

Some panel members argued that monitoring target organ (i.e. brain) temperature could add a layer of clinical safety, improve pathophysiological understanding and allow selective and individualised titration of treatment (i.e. selective brain cooling). It was, however, agreed by the group that more research is needed into optimum methods for measuring brain temperature and its interpretation from both a clinical and resource-availability perspective. In particular, it was highlighted that temperature thresholds for harm are less well defined for brain temperature than core temperature. When brain temperature monitoring is available and in place, the group advised that core temperature should also be assessed with bladder or oesophageal probes since this is part of routine practice and has been studied to a greater extent than brain temperature. The group noted the importance of having a dual source of temperature monitoring when using automated TTC devices to reduce the risk of probe malfunction and subsequent over or undercooling [ 24 ].

After TBI, brain temperature has often been shown to be higher than systemic temperature and can vary independently, with literature noting a difference of as much as 2 °C depending on the individual characteristics of brain pathology and/or probe location, making a consistent and accurate link between the two challenging and possibly inaccurate [ 25 , 26 ]. The group highlighted that targeting brain temperature may allow precise titration of treatment dose, including titration of selective brain cooling with brain temperature management technologies, theoretically reducing side effects associated with systemic hypothermia, whilst delivering neuroprotection and brain temperature management. However, it was concluded that further research is needed in this regard and that not enough evidence exists to support practical recommendations.

ICP management

Temperature control is a key component of ICP management in severe TBI.

Controlled normothermia (i.e., target core temperature 36.0–37.5 °C) should be included as an addition to the Tier 1 and Tier 2 treatments defined within the Seattle International Severe Traumatic Brain Injury Consensus Conference (SIBICC) 2019 guidelines.

Therapeutic hypothermia (i.e., target core temperature ≤ 36.0 °C) should be considered in cases where tier 1 and 2 treatments (as per SIBICC guidance) have failed to control ICP.

If hypothermia is considered to control ICP, target temperature should be managed as close to normothermia as possible.

ICP monitoring remains a critical component in the management of severe TBI [ 27 , 28 ]. The group unanimously agreed that temperature control is a key aspect of managing ICP, highlighting that an increase in temperature can lead to an increase in cerebral metabolism and augmented cerebral blood flow, and a simultaneous increase in cerebral blood volume. In cases of exhausted compensatory mechanisms, these factors can precipitate intracranial hypertension [ 20 ], which in turn can have a deleterious effect on overall outcome.

Because there is often no single pathophysiological pathway of ICP elevation, its management is complex. The most recent versions of the Brain Trauma Foundation TBI guidelines do not contain treatment protocols, in part due to a lack of solid evidence around the relative efficacy of available interventions [ 27 ]. To address this, the Seattle International Severe Traumatic Brain Injury Consensus Conference (SIBICC) developed a consensus-based practical algorithm for tiered management of severe TBI guided by ICP measurements [ 28 ].

One of the most impactful outcomes from this consensus meeting was the acknowledgement of the essential role of temperature control for ICP management in severe TBI, and the recommendation that controlled normothermia (i.e., target core temperature 36.0–37.5 °C) should be considered in addition to Tier 1 and Tier 2 treatments. The group was keen to harmonise this output with SIBICC by suggesting a more aggressive and specific management with the addition of controlled normothermia in Tiers 1 and 2, adding a layer of clinical safety beyond merely the avoidance of fever over 38.0 °C in Tier 0, as shown in Fig.  2 . In cases when hypothermia is considered (i.e., SIBICC Tier 3), the group recommended that target temperature be managed as close to normothermia as possible, based on an individualised risk–benefit assessment [ 29 ].

figure 2

Intracranial pressure management algorithm for severe TBI edited from SIBICC 2019 [ 28 ]. * Including TTC in tiers 1 and 2 is the suggested addition from the TTC-TBI group to the original SIBICC tiers (green bars). *When possible, the lowest tier should be used. It is not necessary to use all modalities in a previous tier before moving to the next tier. Consider repeat CT and surgical options for space occupying lesions. CPP cerebral perfusion pressure, CT computed tomography, EEG electroencephalography, Hb haemoglobin, kPa kilopascal, mmHg milimetre of mercury, PaCO 2 arterial partial pressure of carbon dioxide, SpO 2 arterial oxygen saturation

No consensus was reached on whether hypothermia was a viable temporising strategy in patients with impending cerebral herniation, in patients awaiting haematoma evacuation or decompression, or before consideration of barbiturate coma. Whilst the group acknowledged that therapeutic hypothermia can be effective in reducing ICP, there was no consensus on whether this could be induced rapidly enough in these circumstances, and it was felt that insufficient evidence was available to provide pragmatic recommendations on its indication in these extreme clinical circumstances.

Whilst the majority of experts indicated 35.0 °C as the lowest target temperature to be considered in these circumstances, no consensus was reached. The discussion highlighted that insufficient evidence exists to support practical recommendations and highlighted the importance of an individualised risk–benefit assessment. It was also noted that centres might have a varying degree of familiarity with different therapeutic options, including ease of access to neurosurgical options (i.e. ventricular drainage, decompression) and this may have an impact on clinician preference for hypothermia as a temporising therapeutic modality.

The group also discussed the indication of barbiturates in the context of ICP control following severe TBI, not reaching consensus on whether therapeutic hypothermia should be attempted before considering barbiturates. The group noted that both barbiturate-induced burst-suppression and therapeutic hypothermia have distinctive side effects and concluded that no recommendations for standard clinical practice could be made beyond what was already stated in SIBICC guidance.

Neurogenic fever (core temperature > 37.5 °C) driven by neurological dysregulation in the absence of sepsis or a clinically significant systemic inflammatory process is relatively common in TBI, and it should be promptly detected and treated (i.e., with controlled normothermia targeting 36.0 °C to 37.5 °C), irrespective of ICP level.

Controlled normothermia should be considered when pyrexia is secondary to sepsis or inflammatory processes, and when the patient is perceived to be at risk of secondary brain injury, especially in the acute phase of TBI.

Uncontrolled fever (neurogenic or secondary to inflammation or infection) can precipitate secondary brain injury in patients with severe TBI.

It was widely agreed that neurogenic fever, defined here as core temperature > 37.5 °C driven by neurological dysregulation in the absence of sepsis or a clinically significant inflammatory process is common in intensive care and it has been found to be associated with an increased risk of complications and unfavourable outcome [ 9 , 14 , 15 ]. In the setting of neurogenic fever developing in comatose patients with acute traumatic encephalopathies, controlled normothermia targeting 36.0–37.5 °C was recommended in tier 1 and 2 of the ICP management algorithm.

Correctly differentiating central fever against fever of infectious origin is both challenging and clinically important due to the impact of failing to identify a treatable condition, the negative consequences of antibiotic overuse, and the detrimental effect of hyperthermia on brain-injured patients [ 17 , 30 , 31 ]. However, the group noted that physiological processes such as brain metabolic rate of oxygen, CO 2 control, brain tissue oxygenation (P bt O 2 ) and ICP are directly related to temperature, and that the deleterious effects and likelihood of secondary injury may occur irrespective of whether temperature is raised due to infection or impaired thermoregulation. This therefore highlights the need for acute management of temperature regardless of the source of the pyrexia, although added focus must be placed on the management of nuanced patient characteristics such as those with severe TBI with impending herniation and/or obliterated basal cisterns, as opposed those with low ICP and preserved intracranial compliance.

In line with current research [ 9 , 11 , 32 ], it was agreed that the development of fever is common in TBI cases, and that it can precipitate secondary brain injury and adversely affect patient outcome. It is therefore of utmost importance to prevent or promptly treat fever when detected. The group agreed that while some degree of controlled pyrexia may be allowed during the subacute phase of disease, ‘uncontrolled’ fever requires urgent management in the acute phase as long as the patient is still perceived to be at significant risk of secondary brain injury.

Fever control is recommended in patients with severe TBI who have seizures or are perceived to be at high risk of seizures.

In patients with severe TBI who are sedated and ventilated, controlled normothermia, irrespective of ICP, should be initiated reactively when fever is detected.

When neurogenic fever is detected in TBI cases, controlled normothermia should be continued for as long as the brain remains at risk of secondary brain damage.

The group strongly recommended that fever control and controlled normothermia are of particular relevance in patients perceived to be at high risk of seizures and, more in general, secondary brain injury. The assessment of whether an individual patient should be considered ‘at risk of seizures’ or ‘at risk of secondary brain injury’ remains the responsibility of the managing physician. The group defined risk factors for seizures as a history of seizures, the presence of temporal contusions or depressed skull fractures. Features associated with a higher ‘risk of secondary brain injury’ included labile ICP, obliterated basal cisterns, midline shift or subfalcine herniation, and other signs of exhausted intracranial volume buffering reserve. While no consensus was reached on a specific temperature range to target during controlled normothermia, the group agreed that the reactive initiation of temperature control was important in sedated and ventilated TBI patients, with agreement on a pragmatic setting of a target core temperature range of 36.0–37.5 °C to accommodate expected fluctuations of ± 0.5 °C while avoiding spikes over 38.0 °C [ 28 ].

Hypothermic TTC induction

It is recommended that the rapid induction of hypothermia in traumatic brain injury cases should be achieved with automated feedback-controlled temperature management devices.

In line with current research [ 17 ], the group widely agreed on the reactive use of an automated feedback-controlled device for the application of optimal TTC. The TTC process can be divided into three phases: induction, maintenance, and rewarming [ 9 , 16 ]. As explained in existing literature, varying availability of devices and financial aspects may dictate choice, and while non-automated methods of temperature control are cheaper and easier to apply, the level of control offered is poor and their use should be limited to the induction phase, as adjuncts to automated devices. [ 17 , 33 ] Whilst antipyretics such as acetaminophen (paracetamol) or nonsteroidal anti-inflammatory drugs (NSAIDs) are widely acknowledged in intensive care unit (ICU) settings for their role in fever management, it is recognised that in the context of severe TBI, the efficacy of antipyretics in controlling fever and minimising temperature variability is limited. The application of therapeutic hypothermia requires constant monitoring of core body temperature in order to achieve an accurate target temperature during induction to prevent overcooling, to assess variations during the maintenance phase, and to ensure a steady, controlled rewarming phase [ 16 ].

There was no agreed recommendation from the group as to whether ICUs should stock readily available ice-cold NaCl solutions of different concentrations for the management of ICP crises, citing a lack of clear evidence to draw upon. The group did however highlight the fact that the rapid infusion of ice-cold saline is an inexpensive and readily available option for lowering core body temperature [ 9 ], with the rapidity of response to ice-cold infusions being regarded as a valuable aspect of TTC induction.

TTC maintenance

An automated feedback-controlled TTC device that enables precise temperature control is desirable for the initiation of TTC and maintenance at target temperature in patients with severe TBI.

The maximum temperature variation that a patient should experience during normothermia is less than or equal to +/− 0.5 °C per hour and ≤ 1 °C per 24-hperiod

When hypothermia is indicated, treatment should be continued for as long as the brain is considered to be at risk of secondary brain injury.

Automated feedback-controlled devices for TTC are powerful tools, encouraging the delivery of quality care and aiming to improve neurological outcome [ 13 , 17 ], minimising the chances of temperature variability. Temperature variability is the deviation of patient temperature outside of the goal, typically reported as mean deviation or percent of time outside of target [ 9 ]. The group noted that there is a level of pragmatism to be adopted in TTC maintenance, discussing that while more time spent in fever can negatively impact neurological outcome, fluctuations in temperature may also affect outcome [ 17 ], and consensus was reached on the importance of maintaining temperature at as consistent a level as possible with the group settling on a fluctuation range of less than or equal to ± 0.5 °C per hour and ≤ 1 °C per 24-h period. In instances where an automated feedback-controlled device is not available, the group noted the importance of increased staff awareness of patient status to ensure fluctuations outside of this range are appropriately managed. The group highlighted that a dedicated protocol for sedation, analgesia and shivering management might be helpful to ensure consistent application of optimal TTC.

The group agreed that when indicated, hypothermia should be continued for as long as the individual practitioner considers the brain to be at risk of secondary injury. These considerations were supported with a suggestion that it should be maintained for as short a time as possible.

Rewarming following hypothermic TTC

Obtaining an interval scan and/or an alternative assessment of intracranial compliance, in addition to the absolute number of ICP, is recommended before rewarming.

Rebound hyperthermia should be prevented whenever possible or promptly treated in cases when the brain is perceived to be at risk of secondary brain injury.

In cases in which the patient is being rewarmed from therapeutic hypothermia (core temperature lower than 36.0 °C), the group agreed that once ICP has been maintained within controlled limits and de-escalation of treatment intensity is considered, it is sensible to ensure the patient has sufficient intracranial volume buffering reserve through the use of an interval scan and/or an alternative measure of intracranial compliance, before commencing the rewarming process. The group also noted the high prevalence and potential risks associated with rebound hyperthermia when TTC is discontinued following therapeutic hypothermia, highlighting the importance of continued vigilance and careful temperature control in the rewarming phase.

Whilst no consensus was reached on recommended rewarming rates, the group agreed that controlled rewarming with an automated feedback-controlled device may reduce the risk of rapid temperature variations and rebound pyrexia that can precipitate secondary brain injury and compromise care [ 16 , 33 ]. The group highlighted how controlled rewarming may improve the ability of clinicians to more effectively control important inter-dependent clinical variables such as PaCO 2 , ventilation settings and depth of sedation.

TTC for shivering

It is important to assess, document and manage shivering in severe TBI patients.

Whenever ICP is labile and shivering is detected, neuromuscular blockers should be considered after ensuring appropriate depth of sedation.

In self-ventilating patients in the subacute phase of severe TBI, an individualised risk–benefit assessment should be undertaken regarding the strict indications of controlled normothermia.

Permissive hyperthermia should be considered in cases where risk of secondary brain injury resulting from pyrexia is thought to be low, and when shivering cannot be controlled with first line treatments such as NSAIDs, opiates, magnesium or counter warming.

In line with current literature, it was widely agreed that shivering should be managed in patients following severe TBI. Shivering can reduce brain tissue oxygenation leading to cerebral metabolic stress, which may therefore negate the neuroprotective benefits of TTC [ 9 , 34 , 35 , 36 ].

Titration of sedation and the use of neuromuscular blocking agents provides intensivists with readily available and effective options for shivering control in critically ill patients [ 37 ]. To ensure appropriate and effective use however, treating staff must be aware of the nuances of selecting the correct agent, monitoring the depth of neuromuscular blockade, and ensuring adequate skeletal muscle recovery once therapy with neuromuscular blockers has ceased. In cases of shivering when ICP is labile, the group agreed in line with current literature that ensuring depth of sedation before administering neuromuscular blockers is of utmost importance [ 37 , 38 ]. When using pharmacologic agents for shivering management, treating staff must consider potential pharmacokinetic and pharmacodynamic variation and monitor for efficacy (i.e. shivering control) and safety (i.e. adverse events and drug-drug interactions) [ 9 ].

The group agreed that in patients who are perceived to be at relatively lower risk of secondary brain injury (i.e. self-ventilating patients in the sub-acute phase of severe TBI), permissive hyperthermia may be considered over TTC, especially if the latter therapeutic option would require sedation or other invasive interventions. The group agreed that an individualised risk–benefit assessment should ultimately be undertaken before commencing controlled normothermia in such patients.

‘Time within target range’, ‘burden of fever’ and similar metrics can be considered as indicators of quality of temperature management.

‘Time within target range’ and ‘burden of fever’ were considered by the group to be appropriate metrics of quality temperature management. It was widely acknowledged that these metrics should be weighed by patient length of stay and/or duration of monitoring for appropriate statistical interpretation. The group was also careful to note that the administrative burden on physicians is already high and acknowledged the fact that some centres may not have access to electronic patient data management systems, so it was agreed that it was unrealistic for this group to issue prescriptive recommendations on auditing practices. In light of the high heterogeneity across centres [ 9 ], here the group were keen to clarify that wherever possible, documenting metrics such as ‘time within target range’ and ‘burden of fever’ may improve their ability to deliver data-driven service improvement and temperature control.

This consensus review was undertaken to evaluate current evidence on the application of TTC in the management of severe TBI in a critical care setting, and to develop a set of practical recommendations to address identified gaps in current published evidence.

As highlighted by the SIBICC 2020 group, the gap between published evidence and management protocols is bridged by expert opinion [ 39 ]. The optimal method for the provision of high-quality TTC remains unknown, and barriers to its consistent implementation include the lack of evidence-based treatment protocols, knowledge deficiencies, limited access to equipment, lack of financial resources and staff workload. This document aims to address key practice gaps and optimise patient care through multimodal assessment following TBI.

Strengths and limitations

The Delphi process has a number of strengths. Participants are able to reconsider their views in light of the evolving discussions, allowing for an element of reflection that isn’t regularly seen in other studies involving a single time point such as interviews or focus groups [ 40 ]. The element of anonymity offered to the panellists in the survey rounds avoids group conformity and promotes honesty, and the controlled and iterative discussions offer a flexible approach to gathering expert viewpoints on the set research questions. The Delphi method is an iterative process allowing the anonymous inclusion of a number of individuals across diverse locations and areas of expertise and avoiding dominance by any one individual. It uses a systematic progression of repeated rounds of voting and is an effective process for determining expert group consensus where there is little or no definitive evidence and where opinion is important [ 41 , 42 ]. The modified Delphi approach used here combined the early flow of structured information and submission of anonymous responses with the (hybrid) face-to-face discussion and further voting to gain consensus (or establish lack thereof) and expert insight into usual practice regarding non-pharmacological TTC with an automated feedback-controlled device. As cited in existing literature however [ 13 , 17 ], the Delphi process has limitations. The process is vulnerable to drop-outs and technical issues, with the online voting process during our meeting seeing some participants unable to cast their votes on a number of questions, leading to the need for a final anonymous survey round. The group opinions during the meeting may have been impacted by social bias, and the voices across the in-person and online participants may not have been equally heard, highlighting a potential need to ensure consistency in attendance in the same format in future panel meetings.

Our recommendations for the use of automated feedback-controlled TTC devices are based on expert consensus and theoretical benefits, such as precise temperature control and reduced temperature variability, which are thought to potentially improve outcomes in severe TBI management. We acknowledge the current evidence gap and strongly emphasise the need for rigorous research to evaluate the effectiveness of these devices, especially in diverse healthcare settings, including lower-income countries where resource limitations are critical. Future updates to these best-practice recommendations will incorporate emerging evidence to ensure relevance and applicability across different healthcare contexts, aiming for the highest standards of care within the constraints of available resources. While automated feedback-controlled TTC devices represent a significant advancement in the management of temperature in severe TBI patients, offering potential benefits in terms of precision and consistency, it is imperative to recognise the value and applicability of a wide range of temperature management approaches. These include both manual methods and simpler devices, which remain vital in many clinical settings around the world. Our guidelines advocate for the adaptation and implementation of TTC principles based on the specific resources, capabilities, and needs of each clinical setting.

This report has been developed by an expert panel comprised of specialists in neuro-critical care experienced in the management of severe TBI, therefore the recommendations focus on patients managed in a critical care environment. An individualised risk–benefit assessment should be undertaken for each domain to accommodate the high levels of heterogeneity seen across TBI patients, local practice settings, staff training and equipment availability [ 9 ].

TTC is a therapy that has a role in ICP management and may reduce secondary injury and improve long-term neurological outcome for victims of TBI [ 9 ]. Appropriate methods for the implementation of TTC across widely heterogenous clinical settings and patient populations are relatively understudied, and due to a lack of consistent and high-quality evidence, remain largely unknown. Areas of consensus emerging from the Delphi process included TTC being recognised as an essential aspect of high-quality TBI care. Controlled normothermia (36.0–37.5 °C) was strongly recommended as a therapeutic option to be considered in Tier 1 and 2 of the SIBICC ICP management protocol. Temperature management targets should be individualised based on the perceived risk of secondary brain injury and fever aetiology.

Availability of data and materials

All data generated or analysed during this study are included in this article and its supplementary information files.

Abbreviations

Cerebral perfusion pressure

Computed tomography

Electroencephalography

European Society of Anaesthesiology and Intensive Care

European Society of Intensive Care Medicine

Haemoglobin

  • Intracranial pressure

Intensive care unit

Neuro Anaesthesia and Critical Care Society

Sodium chloride

Neuro-intensive care unit

Nonsteroidal anti-inflammatory drugs

Arterial partial pressure of carbon dioxide

Brain tissue oxygenation

Randomised controlled trial

Seattle International Severe Traumatic Brain Injury Consensus Conference

Arterial oxygen saturation

  • Traumatic brain injury
  • Targeted temperature control

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Acknowledgements

The group would like to acknowledge the support of Page & Page, London UK in facilitating the Delphi meeting.

The Delphi Panel meeting in October 2023 was facilitated (through the provision of travel costs, meeting space and refreshments) by Becton, Dickinson and Company. The development of these consensus recommendations was conducted with strict measures to ensure independence from its sponsor. The research team independently conducted all data analyses and drafted the manuscript. The role of BD was limited to providing logistical support for the Delphi panel meeting held in London, including travel costs, meeting space, and refreshments, without any influence over the study's content or conclusions. The Delphi voting process was conducted anonymously, ensuring that panel members could freely express their professional opinions without bias or influence from the sponsoring body or among panel members. The manuscript's drafting, review, and revision processes were carried out independently of BD. The sponsor had no editorial control, ensuring that the recommendations are based on the authors’ independent, professional expertise in targeted temperature management following traumatic brain injury. This article contains the personal and professional opinions of the individual authors and does not necessarily reflect the views and opinions of Becton, Dickinson and Company (“BD”) or any Business Unit or affiliate of BD. If drugs and/or medical devices are cited in the article, please consult package insert and instructions for use of them to know indications, contraindications, and any other more detailed safety information.

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Department of Medicine, BOX 1 Addenbrooke’s Hospital, University of Cambridge, Long Road, Cambridge, CB2 0QQ, UK

Andrea Lavinio, Jonathan P. Coles & David K. Menon

Department of Anaesthesia and Critical Care, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK

IRCCS Policlinico San Martino, Genoa, Italy

Chiara Robba

Department of Intensive Care, Maastricht University Medical Center+, Maastricht, The Netherlands

Marcel Aries

School of Mental Health and Neurosciences, University Maastricht, Maastricht, The Netherlands

Inserm U1216, Department of Anesthesia and Critical Care, CHU Grenoble Alpes, Grenoble Institute Neurosciences, Université Grenoble Alpes, 38000, Grenoble, France

Pierre Bouzat & Jean-Francois Payen

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Department of Anaesthesia and Intensive Care, University Hospital of North Norway, Tromsö, Norway

Shirin Frisvold

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Laura Galarza

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Raimund Helbok

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Jeroen Hermanides

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Mathieu van der Jagt

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University Hospital Basel, Department of Clinical Research, University of Basel, Basel, Switzerland

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AL received consultancy and speaker fees from Beckton, Dickinson and Company (“BD”) for Chairing the Delphi panel and for contributing to the writing of the article. RH received speaker fees from BD and Zoll.

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Supplementary Information

Additional file 1.

. Evaluation of five randomized controlled trials by the ESICM Methodology Group evaluates evulating cooling strategies against traditional interventions. The evaluation highlights methodological heterogeneities and evidential challenges.

Additional file 2

. Delphi questionnaire: Round 1.

Additional file 3

. Delphi questionnaire. Round 3.

Additional file 4

. Systematic review of the literature on targeted temperature control in traumatic brain injury, covering clinical studies from 2013 to 2023.

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Lavinio, A., Coles, J.P., Robba, C. et al. Targeted temperature control following traumatic brain injury: ESICM/NACCS best practice consensus recommendations. Crit Care 28 , 170 (2024). https://doi.org/10.1186/s13054-024-04951-x

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