how is critical thinking related to writing

Writing to Think: Critical Thinking and the Writing Process

“Writing is thinking on paper.” (Zinsser, 1976, p. vii)

Google the term “critical thinking.” How many hits are there? On the day this tutorial was completed, Google found about 65,100,000 results in 0.56 seconds. That’s an impressive number, and it grows more impressively large every day. That’s because the nation’s educators, business leaders, and political representatives worry about the level of critical thinking skills among today’s students and workers.

What is Critical Thinking?

Simply put, critical thinking is sound thinking. Critical thinkers work to delve beneath the surface of sweeping generalizations, biases, clichés, and other quick observations that characterize ineffective thinking. They are willing to consider points of view different from their own, seek and study evidence and examples, root out sloppy and illogical argument, discern fact from opinion, embrace reason over emotion or preference, and change their minds when confronted with compelling reasons to do so. In sum, critical thinkers are flexible thinkers equipped to become active and effective spouses, parents, friends, consumers, employees, citizens, and leaders. Every area of life, in other words, can be positively affected by strong critical thinking.

Released in January 2011, an important study of college students over four years concluded that by graduation “large numbers [of American undergraduates] didn’t learn the critical thinking, complex reasoning and written communication skills that are widely assumed to be at the core of a college education” (Rimer, 2011, para. 1). The University designs curriculum, creates support programs, and hires faculty to help ensure you won’t be one of the students “[showing]no significant gains in . . . ‘higher order’ thinking skills” (Rimer, 2011, para. 4). One way the University works to help you build those skills is through writing projects.

Writing and Critical Thinking

Say the word “writing” and most people think of a completed publication. But say the word “writing” to writers, and they will likely think of the process of composing. Most writers would agree with novelist E. M. Forster, who wrote, “How can I know what I think until I see what I say?” (Forster, 1927, p. 99). Experienced writers know that the act of writing stimulates thinking.

Inexperienced and experienced writers have very different understandings of composition. Novice writers often make the mistake of believing they have to know what they’re going to write before they can begin writing. They often compose a thesis statement before asking questions or conducting research. In the course of their reading, they might even disregard material that counters their pre-formed ideas. This is not writing; it is recording.

In contrast, experienced writers begin with questions and work to discover many different answers before settling on those that are most convincing. They know that the act of putting words on paper or a computer screen helps them invent thought and content. Rather than trying to express what they already think, they express what the act of writing leads them to think as they put down words. More often than not, in other words, experienced writers write their way into ideas, which they then develop, revise, and refine as they go.

What has this notion of writing to do with critical thinking? Everything.

Consider the steps of the writing process: prewriting, outlining, drafting, revising, editing, seeking feedback, and publishing. These steps are not followed in a determined or strict order; instead, the effective writer knows that as they write, it may be necessary to return to an earlier step. In other words, in the process of revision, a writer may realize that the order of ideas is unclear. A new outline may help that writer re-order details. As they write, the writer considers and reconsiders the effectiveness of the work.

The writing process, then, is not just a mirror image of the thinking process: it is the thinking process. Confronted with a topic, an effective critical thinker/writer

• asks questions
• seeks answers
• evaluates evidence
• questions assumptions
• tests hypotheses
• makes inferences
• employs logic
• draws conclusions
• predicts readers’ responses
• creates order
• drafts content
• seeks others’ responses
• weighs feedback
• criticizes their own work
• revises content and structure
• seeks clarity and coherence

Example of Composition as Critical Thinking

“Good writing is fueled by unanswerable questions” (Lane, 1993, p. 15).

Imagine that you have been asked to write about a hero or heroine from history. You must explain what challenges that individual faced and how they conquered them. Now imagine that you decide to write about Rosa Parks and her role in the modern Civil Rights movement. Take a moment and survey what you already know. She refused to get up out of her seat on a bus so a White man could sit in it. She was arrested. As a result, Blacks in Montgomery protested, influencing the Montgomery Bus Boycott. Martin Luther King, Jr. took up leadership of the cause, and ultimately a movement was born.

Is that really all there is to Rosa Parks’s story? What questions might a thoughtful writer ask? Here a few:

• Why did Rosa Parks refuse to get up on that particular day?
• Was hers a spontaneous or planned act of defiance?
• Did she work? Where? Doing what?
• Had any other Black person refused to get up for a White person?
• What happened to that individual or those individuals?
• Why hadn’t that person or those persons received the publicity Parks did?
• Was Parks active in Civil Rights before that day?
• How did she learn about civil disobedience?

Even just these few questions could lead to potentially rich information.

Factual information would not be enough, however, to satisfy an assignment that asks for an interpretation of that information. The writer’s job for the assignment is to convince the reader that Parks was a heroine; in this way the writer must make an argument and support it. The writer must establish standards of heroic behavior. More questions arise:

• What is heroic action?
• What are the characteristics of someone who is heroic?
• What do heroes value and believe?
• What are the consequences of a hero’s actions?
• Why do they matter?

Now the writer has even more research and more thinking to do.

By the time they have raised questions and answered them, raised more questions and answered them, and so on, they are ready to begin writing. But even then, new ideas will arise in the course of planning and drafting, inevitably leading the writer to more research and thought, to more composition and refinement.

Ultimately, every step of the way over the course of composing a project, the writer is engaged in critical thinking because the effective writer examines the work as they develop it.

Why Writing to Think Matters

Writing practice builds critical thinking, which empowers people to “take charge of [their] own minds” so they “can take charge of [their] own lives . . . and improve them, bringing them under [their] self command and direction” (Foundation for Critical Thinking, 2020, para. 12). Writing is a way of coming to know and understand the self and the changing world, enabling individuals to make decisions that benefit themselves, others, and society at large. Your knowledge alone – of law, medicine, business, or education, for example – will not be enough to meet future challenges. You will be tested by new unexpected circumstances, and when they arise, the open-mindedness, flexibility, reasoning, discipline, and discernment you have learned through writing practice will help you meet those challenges successfully.

Forster, E.M. (1927).  Aspects of the novel . Harcourt, Brace & Company.

The Foundation for Critical Thinking. (2020, June 17).  Our concept and definition of critical thinking . https://www.criticalthinking.org/pages/our-concept-of-critical-thinking/411

Lane, B. (1993).  After the end: Teaching and learning creative revision . Heinemann.

Rimer, S. (2011, January 18).  Study: Many college students not learning to think critically . The Hechinger Report. https://www.mcclatchydc.com/news/nation-world/national/article24608056.html

Zinsser, W. (1976).  On writing well: The classic guide to writing nonfiction . HarperCollins.

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Reading & Writing Purposes

Introduction: critical thinking, reading, & writing, critical thinking.

The phrase “critical thinking” is often misunderstood. “Critical” in this case does not mean finding fault with an action or idea. Instead, it refers to the ability to understand an action or idea through reasoning. According to the website SkillsYouNeed [1]:

Critical thinking might be described as the ability to engage in reflective and independent thinking.

In essence, critical thinking requires you to use your ability to reason. It is about being an active learner rather than a passive recipient of information.

Critical thinkers rigorously question ideas and assumptions rather than accepting them at face value. They will always seek to determine whether the ideas, arguments, and findings represent the entire picture and are open to finding that they do not.

Critical thinkers will identify, analyze, and solve problems systematically rather than by intuition or instinct.

Someone with critical thinking skills can:

• Understand the links between ideas.
• Determine the importance and relevance of arguments and ideas.
• Recognize, build, and appraise arguments.
• Identify inconsistencies and errors in reasoning.
• Approach problems in a consistent and systematic way.
• Reflect on the justification of their own assumptions, beliefs and values.

Read more at:  https://www.skillsyouneed.com/learn/critical-thinking.html

Critical thinking—the ability to develop your own insights and meaning—is a basic college learning goal. Critical reading and writing strategies foster critical thinking, and critical thinking underlies critical reading and writing.

Critical Reading

Critical reading builds on the basic reading skills expected for college.

College Readers’ Characteristics

• College readers are willing to spend time reflecting on the ideas presented in their reading assignments. They know the time is well-spent to enhance their understanding.
• College readers are able to raise questions while reading. They evaluate and solve problems rather than merely compile a set of facts to be memorized.
• College readers can think logically. They are fact-oriented and can review the facts dispassionately. They base their judgments on ideas and evidence.
• College readers can recognize error in thought and persuasion as well as recognize good arguments.
• College readers are skeptical. They understand that not everything in print is correct. They are diligent in seeking out the truth.

Critical Readers’ Characteristics

• Critical readers are open-minded. They seek alternative views and are open to new ideas that may not necessarily agree with their previous thoughts on a topic. They are willing to reassess their views when new or discordant evidence is introduced and evaluated.
• Critical readers are in touch with their own personal thoughts and ideas about a topic. Excited about learning, they are eager to express their thoughts and opinions.
• Critical readers are able to identify arguments and issues. They are able to ask penetrating and thought-provoking questions to evaluate ideas.
• Critical readers are creative. They see connections between topics and use knowledge from other disciplines to enhance their reading and learning experiences.
• Critical readers develop their own ideas on issues, based on careful analysis and response to others’ ideas.

The video below, although geared toward students studying for the SAT exam (Scholastic Aptitude Test used for many colleges’ admissions), offers a good, quick overview of the concept and practice of critical reading.

Critical Reading & Writing

College reading and writing assignments often ask you to react to, apply, analyze, and synthesize information. In other words, your own informed and reasoned ideas about a subject take on more importance than someone else’s ideas, since the purpose of college reading and writing is to think critically about information.

Critical thinking involves questioning. You ask and answer questions to pursue the “careful and exact evaluation and judgment” that the word “critical” invokes (definition from The American Heritage Dictionary ). The questions simply change depending on your critical purpose. Different critical purposes are detailed in the next pages of this text.

However, here’s a brief preview of the different types of questions you’ll ask and answer in relation to different critical reading and writing purposes.

When you react to a text you ask:

• “What do I think?” and
• “Why do I think this way?”

e.g., If I asked and answered these “reaction” questions about the topic assimilation of immigrants to the U.S. , I might create the following main idea statement, which I could then develop in an essay:  I think that assimilation has both positive and negative effects because, while it makes life easier within the dominant culture, it also implies that the original culture is of lesser value.

When you apply text information you ask:

• “How does this information relate to the real world?”

e.g., If I asked and answered this “application” question about the topic assimilation , I might create the following main idea statement, which I could then develop in an essay:  During the past ten years, a group of recent emigrants has assimilated into the local culture; the process of their assimilation followed certain specific stages.

When you analyze text information you ask:

• “What is the main idea?”
• “What do I want to ‘test’ in the text to see if the main idea is justified?” (supporting ideas, type of information, language), and
• “What pieces of the text relate to my ‘test?'”

e.g., If I asked and answered these “analysis” questions about the topic immigrants to the United States , I might create the following main idea statement, which I could then develop in an essay: Although Lee (2009) states that “segmented assimilation theory asserts that immigrant groups may assimilate into one of many social sectors available in American society, instead of restricting all immigrant groups to adapting into one uniform host society,” other theorists have shown this not to be the case with recent immigrants in certain geographic areas.

When you synthesize information from many texts you ask:

• “What information is similar and different in these texts?,” and
• “What pieces of information fit together to create or support a main idea?”

e.g., If I asked and answered these “synthesis” questions about the topic immigrants to the U.S. , I might create the following main idea statement, which I could then develop by using examples and information from many text articles as evidence to support my idea: Immigrants who came to the United States during the immigration waves in the early to mid 20th century traditionally learned English as the first step toward assimilation, a process that was supported by educators. Now, both immigrant groups and educators are more focused on cultural pluralism than assimilation, as can be seen in educators’ support of bilingual education. However, although bilingual education heightens the child’s reasoning and ability to learn, it may ultimately hinder the child’s sense of security within the dominant culture if that culture does not value cultural pluralism as a whole.

Critical reading involves asking and answering these types of questions in order to find out how the information “works” as opposed to just accepting and presenting the information that you read in a text. Critical writing involves recording your insights into these questions and offering your own interpretation of a concept or issue, based on the meaning you create from those insights.

Candela Citations

• Crtical Thinking, Reading, & Writing. Authored by : Susan Oaks, includes material adapted from TheSkillsYouNeed and Reading 100; attributions below. Project : Introduction to College Reading & Writing. License : CC BY-NC: Attribution-NonCommercial
• Critical Thinking. Provided by : TheSkillsYouNeed. Located at : https://www.skillsyouneed.com/ . License : Public Domain: No Known Copyright . License Terms : Quoted from website: The use of material found at skillsyouneed.com is free provided that copyright is acknowledged and a reference or link is included to the page/s where the information was found. Read more at: https://www.skillsyouneed.com/
• The Reading Process. Authored by : Scottsdale Community College Reading Faculty. Provided by : Maricopa Community College. Located at : https://learn.maricopa.edu/courses/904536/files/32966438?module_item_id=7198326 . Project : Reading 100. License : CC BY: Attribution
• image of person thinking with light bulbs saying -idea- around her head. Authored by : Gerd Altmann. Provided by : Pixabay. Located at : https://pixabay.com/photos/light-bulb-idea-think-education-3704027/ . License : CC0: No Rights Reserved
• video What is Critical Reading? SAT Critical Reading Bootcamp #4. Provided by : Reason Prep. Located at : https://www.youtube.com/watch?v=5Hc3hmwnymw . License : Other . License Terms : YouTube video
• image of man smiling and holding a lightbulb. Authored by : africaniscool. Provided by : Pixabay. Located at : https://pixabay.com/photos/man-african-laughing-idea-319282/ . License : CC0: No Rights Reserved

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7 Tips for Integrating Critical Thinking into your Writing

"shouldn't you be writing".

Posted June 21, 2019

The stress and tedium that can be associated with writing is a common subject of social media posting by academics, albeit often in a humorous manner. But, think about non-academics, whose main outcome measure of success isn’t based on writing. I wonder how they feel about writing. Though such social media posts may be shared for the purpose of light-hearted humour, there may well be some truth to them. I think it’s fair to suggest that many do not find academic or technical writing to be an easy or enjoyable task. What often increases the workload of this kind of writing is the need for an integration of critical thinking. Of course, some individuals are better at this integration than others and so, it’s useful to discuss how it can be improved. Thus, below are seven tips for helping you integrate critical thinking into your writing.

1. Know the nature of an argument.

Any piece of text that contains words like because , but , however , therefore , thus , yet , etc., is an argument. An argument isn’t just a heated debate, it’s an activity of reason aimed at increasing (or decreasing) the acceptability of some claim or point of view, through presenting reasons and/or objections that either support or refute the claim. You will have to address both, if not multiple, sides of the story—think of it as playing devil’s advocate . Treating your writing in this regard will ease the process and facilitate the application of the rest of these tips.

2. Do your research...properly.

You weren’t born knowledgeable; so, what you know must have been learned from somewhere else. Sometimes, knowledge can be gained from family, friends or life experiences; but, they have no place in academic or technical writing. As a result, you must search for credible information pertinent to the topic. Of course, everyone is biased; so you will already have a point of a view on a topic before you even start researching it. This is natural; however, don’t feed into this confirmation bias by corrupting your research strategy. That is, search for sources that both justify what you believe about the topic as well as sources that refute your perspective. Consider both (or, if more than two, multiple) sides of the story and be honest with yourself about which pieces of information: come from the most credible sources; are most relevant to the specificity of not only the topic, but the central claim itself; are the most logical; and are the most successful at avoiding bias . The sources you should be using are peer-reviewed academic journals—many of which are freely available through Google Scholar . Furthermore, give credit where credit is due—reference the research appropriately in your writing. I often explain to students new to academic referencing that it’s a great opportunity to show off the fact that they did their research and applied critical evaluation. The more references you have, the more evidence you have for having done your research!

3. Develop an organised structure.

Not a single word should be written before you have an organised structure for the piece outlined (I highly recommend argument mapping , which is a means of visually representing the structure of an argument and is supported by research as having positive effects on critical thinking [Butchart et al., 2009; Dwyer, 2011; Dwyer, Hogan & Stewart, 2012; van Gelder, Bisset & Cumming, 2004]). Organisation is an important disposition towards critical thinking and being this way inclined will allow you to adapt and cope with the potential ‘surprises’ that may be encountered during the writing process. Introduction , Body and Conclusion— the old stalwarts of any well-organised manuscript are obvious fixtures (see my next post for what goes into each); but, make sure that all of your reasons and objections are also appropriately organised, discussed and laid out within these sections (see Tip 7 for more on structuring reasons and objections).

4. "Quality, not quantity."

Don’t get me wrong, quantity is important. If you don’t present enough information, your argument won’t be convincing and may affect its impact…and if you’re a student, your grade as well. However, the quality of what you present is as much, if not more, important. To address this in your writing, consider the amount of information that is required to be discussed.

Outside of the Introduction and the Conclusion , good arguments generally contain 3 to 5 core reasons to support a claim. Each of those 3 to 5 core reasons requires justification as well; and, so, each needs another 3 to 5 reasons for support. That is, 3 to 5 reasons for 3 to 5 core reasons (don’t forget to include potential objections as well); thus, generally between 12 and 20 points require discussion. Consider this range as your anchor. With that, however, this anchor might require adaptation, depending on word count. For example, in a dissertation or thesis, this range may not be enough and thus, could be applied to each chapter. In cases of very limited word counts, perhaps only 9 points might be more feasible? Furthermore, ask yourself whether you have 12 to 20 points? If not, do more research. If you still haven't achieved the anchor, that’s fine—just make a greater effort to critically evaluate the points you do have (i.e. fewer points will afford you more than enough space for quality evaluation). Personally, I would much rather see 10 points discussed and evaluated well than 25 points merely presented.

5. "Avoid glorious bullsh*t."

I recall a story one of my high school English teachers relayed to my class about her first college assignment. She had come out of high school having aced her Advanced Placement English exam and expected her college marks to reflect her glowing track record. A big red "F" stained the front page of her first English paper, next to the feedback that I now relay to you—a void glorious bullsh*t. It’s a memorable line that reflects the need to omit "waffle" from one's writing. Every paragraph, every sentence, every word has a purpose—if what you write doesn’t have a purpose (other than adding words to your piece), remove it.

The message is similar to concepts like " Keep It Simple, Stupid" (KISS) or Occam’s Razor (a philosophical principle consistent with the fundaments of critical thinking), which roughly translates from Latin as ‘More things should not be used than are necessary’ . Simply, all of these recommendations suggest that less is more , which it truly is in many cases. So, in practice, remove unnecessary and ambiguous words. For example, unless you’re writing a literary piece, adverbs are often a good place to start cutting .

6. Write as if your granny was reading.

If you’re writing about a specialist topic, it’s likely that the language used to convey meaning will be somewhat complex, particularly to someone who's not an expert in that topic area. Similar to the case of the last tip, just because it’s wordy or reads complex doesn’t make it good writing. Being able to simplify a complex concept so that others can understand it is a much better example of good writing. This is of particular importance to students as well. For example, educators wouldn't have set a particular assignment if they didn't know the topic well—they don't want their students to teach them the material, they want them to explain it in their own words for the purpose of assessing their understanding of it. The student’s ability to paraphrase complex information into something accessible to novices is a primary indicator of learning, not repeating something complex, word-for-word from a few different texts. Write as if your granny was reading because if she can understand it, that means you understand it—as will others.

7. Ensure that you have analysed , evaluated and inferred .

Critical thinking refers to purposeful, self-regulatory, reflective judgment, consisting of a number of sub-skills (i.e. analysis, evaluation and inference), that increase the chances of producing a logical solution to a problem or a valid conclusion to an argument (Dwyer, 2017; Dwyer, Hogan & Stewart, 2014). In order to integrate critical thinking into your writing, its core skills need to be applied. Thus, perhaps the most important tip for integrating critical thinking into your writing is ensuring that you have appropriately analysed , evaluated and inferred .

Analysis is used to detect, examine and identify the propositions within an argument, their sources (e.g. research, common beliefs, personal experience) and the role they play (e.g. the main conclusion, the premises and reasons provided to support the conclusion, objections to the conclusion), as well as the inferential relationships among propositions. When it comes to analysing the basis for a person’s belief, we can extract the structure of their argument for analysis (from dialogue and text) by looking for arguments that support or refute the belief; and by looking for arguments that support or object to the previous level of arguments and so on. As a result, what we see is a hierarchical structure (see Tip 3), in which we can analyse each individual proposition by identifying what types of arguments others are using when trying to persuade us to share their point of view.

Evaluation is used to assess previously analysed propositions and claims with respect to their credibility (i.e. of a proposition’s source), relevance (i.e. of a proposition to the claim and other propositions), logical strength (i.e. in terms of the relationships among propositions) and the potential for omissions, bias and imbalance in the argument. Evaluation helps us establish the truth of a claim and when we do this, we can arrive at some conclusions about the overall strengths and weaknesses of arguments. So, if it’s not credible, relevant, logical and unbiased, you should consider excluding it or discussing its weaknesses as an objection.

Inference refers to the gathering of credible, relevant and logical evidence based on the previous analysis and evaluation of available information, for the purpose of drawing a reasonable conclusion. This may imply accepting a conclusion pointed to by an author in light of the evidence they present or proposing an alternative, equally logical, conclusion based on the available evidence. The ability to infer, or generate a conclusion, can be completed by both formal and informal logic strategies in order to derive intermediate conclusions as well as central claims. After inferring a conclusion, we must re-evaluate our resulting argument. When applying the skill of inference, we progress in a somewhat cyclical manner—from inference back to evaluation and again to inference until we are confident in our overall conclusion. An important by-product of this cycle is that our thinking becomes more complex, more organized and more logical.

Butchart, S., Bigelow, J., Oppy, G., Korb, K., & Gold, I. (2009). Improving critical thinking using web-based argument mapping exercises with automated feedback. Australasian Journal of Educational Technology, 25, 2, 268-291.

Dwyer, C.P. (2011). The evaluation of argument mapping as a learning tool. Doctoral Thesis. National University of Ireland, Galway.

Dwyer, C.P. (2017). Critical thinking: Conceptual perspectives and practical guidelines.Cambridge, UK: Cambridge University Press.

Dwyer, C.P., Hogan, M.J., & Stewart, I. (2012). An evaluation of argument mapping as a method of enhancing critical thinking performance in e-learning environments. Metacognition and Learning, 7, 219-244.

Dwyer, C.P., Hogan, M.J. & Stewart, I. (2014). An integrated critical thinking framework for the 21st century. Thinking Skills & Creativity, 12, 43-52.

van Gelder, T.J., Bissett, M., & Cumming, G. (2004). Enhancing expertise in informal reasoning. Canadian Journal of Experimental Psychology 58, 142-52.

Christopher Dwyer, Ph.D., is a lecturer at the Technological University of the Shannon in Athlone, Ireland.

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Critical thinking for critical writing

On this page, non-critical vs. critical reading, modes of critical analysis, steps to writing critically, implications for writing.

Critical writing depends on critical thinking. Your writing will involve reflection on written texts: that is, critical reading.

Your critical reading of a text and thinking about a text enables you to use it to make your own arguments. As a critical thinker and writer, you make judgments and interpretations of the ideas, arguments, and claims of others presented in the texts you read.

The key is this: don’t read looking only or primarily for information . Instead, read to determine ways of thinking about the subject matter.

 TIP: Avoid extracting and compiling lists of evidence, lists of facts, quotations, or examples.

Non-critical   reading is focused on learning the information provided by a source. In this mode, a reader focuses on understanding the information, ideas, and opinions stated within the text. 

Sometimes non-critical reading is a part of our day-to-day lives. For example, we may consult a weather report to help us decide whether or not we need to pack an umbrella when we leave the house. Often, we don't need to be critical readers to get the information we need about the weather. However, if the weather report states that it will be a "sunny, cloudless day" and we can see that it is pouring outside our window, we will likely bring our critical reading abilities back into play! 

How to read critically

1. Determine the central claims or purpose of the text (its thesis). A critical reading attempts to identify and assess how these central claims are developed and argued.

 TIP: Many academic paragraphs have a topic statement at or near the beginning, which indicates the purpose of the paragraph.

2. Begin to make some judgments about context .

• What audience is the text written for?
• Who is it in dialogue with?
• In what historical context is it written?

3. Distinguish the kinds of reasoning the text employs.

• What concepts are defined and used?
• Does the text appeal to a theory or theories?
• Is any specific methodology laid out?
• If there is an appeal to a particular concept, theory, or method, how is that concept, theory, or method then used to organize and interpret the data?
• How has the author analyzed (broken down) the material?

 TIP: Be aware that different disciplines (i.e. history, sociology, philosophy, biology) have different ways of arguing.

4. Examine the evidence (the supporting facts, examples, etc.) the text employs. Supporting evidence is indispensable to an argument, so consider the kinds of evidence used: Statistical? Literary? Historical? From what sources is the evidence taken? Are these sources primary or secondary?

5. Critical reading may involve evaluation . Your reading of a text is already critical if it accounts for and makes a series of judgments about how a text is argued. Some assignments may also require you to assess the strengths and weaknesses of an argument.

Why to read critically

Critical reading is an important step for many academic assignments. Critically engaging with the work of others is often a first step in developing our own arguments, interpretations, and analysis. 

Critical reading often involves re-reading a text multiple times, putting our focus on different aspects of the text. The first time we read a text, we may be focused on getting an overall sense of the information the author is presenting - in other words, simply understanding what they are trying to say. On subsequent readings, however, we can focus on how the author presents that information, the kinds of evidence they provide to support their arguments (and how convincing we find that evidence), the connection between their evidence and their conclusions, etc. etc. 

Example:  A non-critical thinker/reader might read a history book to learn the facts of the situation or to discover an accepted interpretation of those events.

A critical thinker/reader might read the same work to appreciate how a particular perspective on the events and a particular selection of facts can lead to a particular understanding. A critical thinker/reader will likely also think about the perspectives of that event that are NOT being considered or presented in the text. 

What a text says  – restatement . Talks about the same topic as the original text. What a text does – description . Focuses on aspects of the discussion itself. What a text means – interpretation . Analyzes the text and asserts a meaning for the text as a whole.

 TIP: An interpretation includes references to the content (the specific actions referred to), the language (the specific terms used), and the structure (such as the relationship between characters).

1. Take a critical stance:  recognize that every text, author, and argument comes from a perspective and is subject to interpretation and analysis.

2. Pay close attention : read texts not just for  what they say  but also for  how they say it . Notice examples, evidence, word choice, structure, etc. Consider the "fit" between the information a text provides and the way it provides that information. 

3. Think big picture : read texts in their context. This can sometimes also involve doing some research about your sources to learn more about the author, the time in which the text was written, the sources that funded the research, etc. 

4. Bring yourself in : critical writing also involves developing your own understandings, interpretations, analysis, and arguments in response to the texts you are reading. Sometimes this is accomplished by considering the connections/points of divergence between several texts you are reading. It can also involve bringing in your own perspectives and experiences to support or challenge evidence, examples, and/or conclusions. 

Writing critically involves:

• Providing appropriate and sufficient arguments and examples
• Choosing terms that are precise, appropriate, and persuasive
• Making clear the transitions from one thought to another to ensure the overall logic of the presentation
• Editing for content, structure, and language

An increased awareness of the impact of choices of content, language, and structure can help you as a writer to develop habits of rewriting and revision.

Reference: this resource was adapted from Dan Kurland's Critical Reading, at its Core, Plain and Simple

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Critical thinking refers to deliberately scrutinizing and evaluating theories, concepts, or ideas using reasoned reflection and in-depth analysis. The act of thinking critically involves moving beyond simply understanding information, but extend your reasoning by questioning the source of information, its production, and its presentation in order to expose potential bias or researcher subjectivity [i.e., evidence of being influenced by personal opinions and feelings rather than by external determinants ] .

Applying critical thinking to investigating a research problem involves actively challenging basic assumptions and questioning the choices and potential motives underpinning how a study was designed and executed and how the author arrived at particular conclusions or recommended courses of action. Applying critical thinking to writing involves effectively synthesizing information and generating compelling arguments.

Hanscomb, Stuart. Critical Thinking: The Basics . 2nd edition. London: Routledge, 2023; Mintz, Steven. "How the Word "Critical" Came to Signify the Leading Edge of Cultural Analysis." Higher Ed Gamma Blog , Inside Higher Ed, February 13, 2024; Van Merriënboer, Jeroen JG and Paul A. Kirschner. Ten Steps to Complex Learning: A Systematic Approach to Four-component Instructional Design . New York: Routledge, 2017.

Thinking Critically

Applying Critical Thinking to Research and Writing

Professors like to use the term critical thinking; in fact, the idea of being a critical thinker permeates much of higher education writ large. In the classroom, the idea of thinking critically is often mentioned by professors when students ask how they should approach writing a research paper [other approaches your professor might mention include interdisciplinarity, compare and contrast, gendered perspective, multicultural, global, etc.]. However, critical thinking is more than just an approach to research and writing. It is an acquired skill associated with becoming a complex learner capable of discerning important relationships among the elements of, as well as integrating multiple ways of understanding applied to, the research problem. Critical thinking is the lens through which you holistically interrogate a topic.

Given this, critical thinking encompasses a variety of inter-related connotations applied to writing a college-level research paper:

• Integrated and Multi-Dimensional . Critical thinking is not focused on any one element of research, but instead, is flows holistically throughout the process of identifying the research problem, reviewing the literature, applying methods of analysis, describing the results, discussing their implications, and, if appropriate, offering recommendations for further research. It permeates the entire research endeavor from contemplating what to write about to proofreading the final product.
• Humanizes the Research . Thinking critically can help humanize what is being studied by extending the scope of your analysis beyond the traditional boundaries of prior research. The scope of prior research, for example, could have involved only sampling homogeneous populations, only considered certain factors related to the investigation of a phenomenon, or was limited by the way the study was framed or contextualized. Critical thinking supports opportunities to think about incorporating the experiences of traditionally marginalized groups into the research, leading to a more inclusive and representative examination of the topic.
• Non-Linear . This refers to analyzing a research problem in ways that do not rely on sequential decision-making or rational forms of reasoning. Creative thinking relies on intuitive judgement, flexibility, and unconventional approaches to investigating complex phenomena in order to discover new insights, connections, and potential solutions . Thinking critically involves going back and modifying your thinking as new evidence emerges , perhaps multiple times throughout the research process, and then drawing conclusions from multiple perspectives as a result of questioning initial impressions about the topic.
• Normative . This refers to the idea that critical thinking can be used to challenge prior assumptions in ways that advocate for social justice, equity, and resilience, leading to research having a more transformative and expansive impact. In this respect, critical thinking can be viewed as a method for breaking away from dominant cultural norms so as to produce research outcomes that illuminate previously hidden aspects of exploitation and injustice.
• Power Dynamics . Research in the social sciences often includes examining aspects of power and influence, focusing on how it operates, how it can be acquired, and how it can be maintained, thereby shaping social relations, organizations, institutions, and the production and maintenance of knowledge. Thinking critically can reveal how societal structures and forces perpetuate power in ways that marginalizes and oppresses specific groups or communities within the contexts of history , politics, economics, culture, and other factors.
• Reflection . A key component of critical thinking is practicing reflexivity; the act of turning ideas and concepts back onto yourself in order to reveal and clarify your own beliefs, assumptions, and perspectives. Being critically reflexive is important because it can reveal hidden biases you may have that could unintentionally influence how you interpret and validate information. The more reflexive you are, the better able and more comfortable you are in opening yourself up to new modes of understanding.
• Rigorous Questioning . Thinking critically is guided by asking questions that lead to addressing complex principles, theories, concepts, or problems more effectively, and in so doing, help distinguish what is known from from what is not known [or that may be hidden]. Critical thinking involves deliberately framing inquiries not only as hypotheses or axioms, but as a way to apply systematic, disciplined,  in-depth forms of questioning about the research problem and in relation to your position as a researcher within the study
• Social Change . An overarching goal of critical thinking applied to research and writing is to seek to identify and challenge forces of inequality, exploitation, oppression, and marinalization that contribute to maintaining the status quo within institutions of society. This can include, for example, schools, court system, businesses, government agencies, or religious organizations that have been created and maintained through certain ways of thinking within the dominant culture. Thinking critically fosters a sense of awareness and empathy about where social change is needed within the overall research process.

As noted, critical thinking permeates the entire research and writing process. However, it applies in particular to the literature review and discussion sections of your paper. These two sections of a research paper most clearly reflect the external/internal duality of thinking critically.

In reviewing the literature, it is important to reflect upon specific aspects of prior research, such as, 1) determining if the research design effectively establishes cause and effect relationships or provides insight into explaining why certain phenomena do or do not occur; 2) assessing whether the method of gathering data or information supports the objectives of your study; and, 3) evaluating if the assumptions used t o arrive at a specific conclusion are evidence-based and relevant to addressing the topic. Critically thinking applies to these elements of reviewing prior research by assessing how each source might perpetuate inequalities or hide the voices of others, thereby, limiting its applicability for understanding the scope of the problem and its impact throughout society.

Critical thinking applies to the discussion section of your paper because this is where you contemplate the findings of your study and explain its significance in relation to addressing the research problem. Discussion involves more than just summarizing findings and describing outcomes. It includes deliberately reflecting upon the importance of the findings and providing a reasoned explanation why your paper helps fill a gap in the literature or expand knowledge and understanding in ways that inform practice. Critical thinking also uses reflection to examine your own beliefs concerning the significance of the results in ways that avoid using biased judgment and decision making.

Using Questions to Enable Critical Thinking

At its most fundamental level, critical thinking is thinking about thinking in ways that improve the effectiveness of your ability to reason, analyze, synthesize, evaluate, and report information and, as a result, it advances deeper explorations of the topic*. From a practical standpoint, critical thinking is an act of introspective self-examination that involves formulating open-ended questions that inspire higher levels of reasoning about a research problem. The purpose of asking questions during the research process is to apply a framework of inquiry that challenges conventional assumptions, scrutinizes the evidence presented, determines how effectively arguments have been supported by that evidence, discerns patterns or trends in the findings, and helps imagine alternative outcomes if new or different factors were introduced.

Below are examples of questions about prior research that can stimulate critical thinking:

• Why is this a problem?
• Why does this research problem matter?
• Does the problem matter to everyone or just certain groups?
• How might your perspective change if you were on the other side of the argument?
• What patterns or connections can you see in the results?
• What key factors could have altered the outcomes described in the results?
• What evidence would be needed to support any alternative outcomes?
• Should there be any additional or alternative interpretations of the research outcomes?
• What is the explanation for the cause of an event or phenomenon?
• Why has a particular situation or condition arisen?
• Who will be impacted by the recommendations posed by the author?
• Who might be excluded from the author’s recommendations?
• When and how will you know that the recommendations have worked?
• In what ways can you apply knowledge from this study to new situations?
• What is another way to look at how the study was designed?
• How does the study contradict or confirm your understanding of the research problem?
• Do the outcomes of the study inform your own lived experiences?
• What do you think is the significance of this study and why?
• What are the overall strengths and weakness of this study?

NOTE: Being a critical thinker doesn't just happen. Casting a critical eye on how effectively others have studied a research problem requires developing self-confidence in your own abilities to actively engage with information, to consistently ask how and why questions concerning the research, and to deliberately analyze arguments and recommendations set forth by the author. Examining critically your own beliefs and feeling about your writing involves a willingness to be comfortable questioning yourself in a way that promotes a strong sense of self-awareness and introspection. Together, these outward and inward looking habits can help improve your critical thinking skills and inform how to effectively research and write a college-level research paper.

* Kharbach, Med. “Examples of Critical Thinking Questions for Students.” Educational Technology and Mobile Learning blog , Last Update: November 10, 2023.

Behar-Horenstein, Linda S., and Lian Niu. “Teaching Critical Thinking Skills in Higher Education: A Review of the Literature.” Journal of College Teaching and Learning 8 (February 2011): 25-41; Bayou, Yemeserach and Tamene Kitila. "Exploring Instructors’ Beliefs about and Practices in Promoting Students’ Critical Thinking Skills in Writing Classes." GIST–Education and Learning Research Journal 26 (2023): 123-154; “Bloom's Taxonomy.” Centre for Teaching Excellence. University of Waterloo; “Higher Order Thinking: Bloom’s Taxonomy.” The Learning Center. University of North Carolina; Butcher, Charity. "Using In-class Writing to Promote Critical Thinking and Application of Course Concepts." Journal of Political Science Education 18 (2022): 3-21; Krathwohl, David R. “A Revision of Bloom's Taxonomy: An Overview.” Theory into Practice 41 (Autumn 2002): 212-218; Loseke, Donileen R. Methodological Thinking: Basic Principles of Social Research Design. Thousand Oaks, CA: Sage, 2012; Mintz, Steven. "How the Word "Critical" Came to Signify the Leading Edge of Cultural Analysis." Higher Ed Gamma Blog , Inside Higher Ed, February 13, 2024; Hart, Claire et al. “Exploring Higher Education Students’ Critical Thinking Skills through Content Analysis.” Thinking Skills and Creativity 41 (September 2021): 100877; Lewis, Arthur and David Smith. "Defining Higher Order Thinking." Theory into Practice 32 (Summer 1993): 131-137; Sabrina, R., Emilda Sulasmi, and Mandra Saragih. "Student Critical Thinking Skills and Student Writing Ability: The Role of Teachers' Intellectual Skills and Student Learning." Cypriot Journal of Educational Sciences 17 (2022): 2493-2510. Suter, W. Newton. Introduction to Educational Research: A Critical Thinking Approach. 2nd edition. Thousand Oaks, CA: SAGE Publications, 2012; Van Merriënboer, Jeroen JG and Paul A. Kirschner. Ten Steps to Complex Learning: A Systematic Approach to Four-component Instructional Design. New York: Routledge, 2017; Vance, Charles M., et al. "Understanding and Measuring Linear–Nonlinear Thinking Style for Enhanced Management Education and Professional Practice." Academy of Management Learning and Education 6 (2007): 167-185; Yeh, Hui-Chin, Shih-hsien Yang, Jo Shan Fu, and Yen-Chen Shih. "Developing College Students’ Critical Thinking through Reflective Writing." Higher Education Research & Development 42 (2023): 244-259.

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Academic Writing: Critical Thinking & Writing

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Critical Thinking

One of the most important features of studying at university is the expectation that you will engage in thinking critically about your subject area. 

Critical thinking involves asking meaningful questions concerning the information, ideas, beliefs, and arguments that you will encounter. It requires you to approach your studies with a curious, open mind, discard preconceptions, and interrogate received knowledge and established practices.

Critical thinking is key to successfully expressing your individuality as an independent learner and thinker in an academic context. It is also a valuable life skill. 

Critical thinking enables you to:

• Evaluate information, its validity and significance in a particular context.
• Analyse and interpret evidence and data in response to a line of enquiry.
• Weigh-up alternative explanations and arguments.
• Develop your own evidence-based and well-reasoned arguments.
• Develop well-informed viewpoints.
• Formulate your own independent, justifiable ideas.
• Actively engage with the wider scholarship of your academic community.

Writing Critically

Being able to demonstrate and communicate critical thinking in your written assignments through critical writing is key to achieving academic success. 

Critical writing can be distinguished from descriptive writing which is concerned with conveying information rather than interrogating information. Understanding the difference between these two styles of academic writing and when to use them is important.

The balance between descriptive writing and critical writing will vary depending on the nature of the assignment and the level of your studies. Some level of descriptive writing is generally necessary to support critical writing. More sophisticated criticality is generally required at higher levels of study with less descriptive content. You will continue to develop your critical writing skills as you progress through your course.

Descriptive Writing and Critical Writing

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Descriptive writing demonstrates the knowledge you have of a subject, and your knowledge of what other people say about that subject.  Descriptive writing often responds to questions framed as ‘what’ , ‘where’ , ‘who’ and ‘when’ .

Descriptive writing might include the following:

• Description of what something is or what it is about (an account, facts, observable features, details): a topic, problem, situation, or context of the subject under discussion.
• Description of where it takes place (setting and context), who is involved and when it occurs. 
• Re-statement or summary of what others say about the topic.
• Background facts and information for a discussion.

Description usually comes before critical content so that the reader can understand the topic you are critically engaging with.

Critical writing requires you to apply interpretation, analysis, and evaluation to the descriptions you have provided. Critical writing often responds to questions framed as ‘how’ or ‘why’ . Often, critical writing will require you to build an argument which is supported by evidence. 

Some indicators of critical writing are:

• Investigation of positive and negative perspectives on ideas
• Supporting ideas and arguments with evidence, which might include authoritative sources, data, statistics, research, theories, and quotations
• Balanced, unbiased appraisal of arguments and counterarguments/alternative viewpoints
• Honest recognition of the limitations of an argument and supporting evidence
• Plausible, rational, convincing, and well-reasoned conclusions 

Critical writing might include the following:

• Applying an idea or theory to different situations or relate theory to practice. Does the idea work/not work in practice? Is there a factor that makes it work/not work? For example: 'Smith's (2008) theory on teamwork is effective in the workplace because it allows a diverse group of people with different skills to work effectively'.
• Justifying why a process or policy exists. For example: 'It was necessary for the nurse to check the patient's handover notes because...'
• Proposing an alternative approach to view and act on situations. For example: 'By adopting a Freirian approach, we could view the student as a collaborator in our teaching and learning'. Or: 'If we had followed the NMC guidelines we could have made the patient feel calm and relaxed during the consultation'.
• Discussion of the strengths and weaknesses of an idea/theory/policy. Why does this idea/theory/policy work? Or why does this idea not work? For example: 'Although Smith's (2008) theory on teamwork is useful for large teams, there are challenges in applying this theory to teams who work remotely'. 
• Discussion of how the idea links to other ideas in the field (synthesis). For example: 'the user experience of parks can be greatly enhanced by examining Donnelly's (2009) customer service model used in retail’.
• Discussion of how the idea compares and contrasts with other ideas/theories. For example: ‘The approach advocated by the NMC differs in comparison because of factor A and factor C’.
• Discussion of the ‘’up-to-datedness” and relevance of an idea/theory/policy (its currency). For example: 'although this approach was successful in supporting the local community, Smith's model does not accommodate the needs of a modern global economy'. 
• Evaluating an idea/theory/policy by providing evidence-informed judgment. For example: 'Therefore, May's delivery model should be discontinued as it has created significant issues for both customers and staff (Ransom, 2018)'.
• Creating new perspectives or arguments based on knowledge. For example: 'to create strong and efficient buildings, we will look to the designs provided by nature. The designs of the Sydney Opera House are based on the segments of an orange (Cook, 2019)'. 

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Learning to Improve: Using Writing to Increase Critical Thinking Performance in General Education Biology

Ian j quitadamo, martha j kurtz.

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Address correspondence to: Ian J. Quitadamo ( [email protected] )

Corresponding author.

Received 2006 Nov 27; Revised 2007 Feb 16; Accepted 2007 Feb 19.

Increasingly, national stakeholders express concern that U.S. college graduates cannot adequately solve problems and think critically. As a set of cognitive abilities, critical thinking skills provide students with tangible academic, personal, and professional benefits that may ultimately address these concerns. As an instructional method, writing has long been perceived as a way to improve critical thinking. In the current study, the researchers compared critical thinking performance of students who experienced a laboratory writing treatment with those who experienced traditional quiz-based laboratory in a general education biology course. The effects of writing were determined within the context of multiple covariables. Results indicated that the writing group significantly improved critical thinking skills whereas the nonwriting group did not. Specifically, analysis and inference skills increased significantly in the writing group but not the nonwriting group. Writing students also showed greater gains in evaluation skills; however, these were not significant. In addition to writing, prior critical thinking skill and instructor significantly affected critical thinking performance, whereas other covariables such as gender, ethnicity, and age were not significant. With improved critical thinking skill, general education biology students will be better prepared to solve problems as engaged and productive citizens.

INTRODUCTION

A national call to improve critical thinking in science.

In the past several years, an increasing number of national reports indicate a growing concern over the effectiveness of higher education teaching practices and the decreased science (and math) performance of U.S. students relative to other industrialized countries ( Project Kaleidoscope, 2006 ). A variety of national stakeholders, including business and educational leaders, politicians, parents, and public agencies, have called for long-term transformation of the K–20 educational system to produce graduates who are well trained in science, can engage intelligently in global issues that require local action, and in general are better able to solve problems and think critically. Specifically, business leaders are calling for graduates who possess advanced analysis and communication skills, for instructional methods that improve lifelong learning, and ultimately for an educational system that builds a nation of innovative and effective thinkers ( Business-Higher Education Forum and American Council on Education, 2003 ). Education leaders are similarly calling for institutions of higher education to produce graduates who think critically, communicate effectively, and who employ lifelong learning skills to address important scientific and civic issues ( Association of American Colleges and Universities, [AACU] 2005 ).

Many college faculty consider critical thinking to be one of the most important indicators of student learning quality. In its 2005 national report, the AACU indicated that 93% of higher education faculty perceived analytical and critical thinking to be an essential learning outcome (AACU, 2005) whereas 87% of undergraduate students indicated that college experiences contributed to their ability to think analytically and creatively. This same AACU report showed that only 6% of undergraduate seniors demonstrated critical thinking proficiency based on Educational Testing Services standardized assessments from 2003 to 2004. During the same time frame, data from the ACT Collegiate Assessment of Academic Proficiency test showed a similar trend, with undergraduates improving their critical thinking less than 1 SD from freshman to senior year. Thus, it appears a discrepancy exists between faculty expectations of critical thinking and students' ability to perceive and demonstrate critical thinking proficiency using standardized assessments (AACU, 2005).

Teaching that supports the development of critical thinking skills has become a cornerstone of nearly every major educational objective since the Department of Education released its six goals for the nation's schools in 1990. In particular, goal three of the National Goals for Education stated that more students should be able to reason, solve problems, and apply knowledge. Goal six specifically stated that college graduates must be able to think critically ( Office of Educational Research and Improvement, 1991 ). Since 1990, American education has tried—with some success—to make a fundamental shift from traditional teacher-focused instruction to more student-centered constructivist learning that encourages discovery, reflection, and in general is thought to improve student critical thinking skill. National science organizations have supported this trend with recommendations to improve the advanced thinking skills that support scientific literacy ( American Association for Higher Education, 1989 ; National Research Council, 1995 ; National Science Foundation, 1996 ).

More recent reports describe the need for improved biological literacy as well as international competitiveness ( Bybee and Fuchs, 2006 ; Klymkowsky, 2006 ). Despite the collective call for enhanced problem solving and critical thinking, educators, researchers, and policymakers are discovering a lack of evidence in existing literature for methods that measurably improve critical thinking skills ( Tsui, 1998 , 2002 ). As more reports call for improved K–20 student performance, it is essential that research-supported teaching and learning practices be used to better help students develop the cognitive skills that underlie effective science learning ( Malcom et al., 2005 ; Bybee and Fuchs, 2006 ).

Critical Thinking

Although they are not always transparent to many college students, the academic and personal benefits of critical thinking are well established; students who can think critically tend to get better grades, are often better able to use reasoning in daily decisions ( U.S. Department of Education, 1990 ), and are generally more employable ( Carnevale and American Society for Training and Development, 1990 ; Holmes and Clizbe, 1997 ; National Academy of Sciences, 2005 ). By focusing on instructional efforts that develop critical thinking skills, it may be possible to increase student performance while satisfying national stakeholder calls for educational improvement and increased ability to solve problems as engaged and productive citizens.

Although academics and business professionals consider critical thinking skill to be a crucial outcome of higher education, many would have difficulty defining exactly what critical thinking is. Historically, there has been little agreement on how to conceptualize critical thinking. Of the literally dozens of definitions that exist, one of the most organized efforts to define (and measure) critical thinking emerged from research done by Peter Facione and others in the early 1990s. Their consensus work, referred to as the Delphi report, was accomplished by a group of 46 leading theorists, teachers, and critical thinking assessment specialists from a variety of academic and business disciplines ( Facione and American Philosophical Association, 1990 ). Initial results from the Delphi report were later confirmed in a national survey and replication study ( Jones et al., 1995 ). In short, the Delphi panel expert consensus describes critical thinking as a “process of purposeful self-regulatory judgment that drives problem-solving and decision-making” ( Facione and American Philosophical Association, 1990 ). This definition implies that critical thinking is an intentional, self-regulated process that provides a mechanism for solving problems and making decisions based on reasoning and logic, which is particularly useful when dealing with issues of national and global significance.

The Delphi conceptualization of critical thinking encompasses several cognitive skills that include: 1) analysis (the ability to break a concept or idea into component pieces in order to understand its structure and inherent relationships), 2) inference (the skills used to arrive at a conclusion by reconciling what is known with what is unknown), and 3) evaluation (the ability to weigh and consider evidence and make reasoned judgments within a given context). Other critical thinking skills that are similarly relevant to science include interpretation, explanation, and self-regulation ( Facione and American Philosophical Association, 1990 ). The concept of critical thinking includes behavioral tendencies or dispositions as well as cognitive skills ( Ennis, 1985 ); these include the tendency to seek truth, to be open-minded, to be analytical, to be orderly and systematic, and to be inquisitive ( Facione and American Philosophical Association, 1990 ). These behavioral tendencies also align closely with behaviors considered to be important in science. Thus, an increased focus on teaching critical thinking may directly benefit students who are engaged in science.

Prior research on critical thinking indicates that students' behavioral dispositions do not change in the short term ( Giancarlo and Facione, 2001 ), but cognitive skills can be developed over a relatively short period of time (Quitadamo, Brahler, and Crouch, unpublished results). In their longitudinal study of behavioral disposition toward critical thinking, Giancarlo and Facione (2001) discovered that undergraduate critical thinking disposition changed significantly after two years. Specifically, significant changes in student tendency to seek truth and confidence in thinking critically occurred during the junior and senior years. Also, females tended to be more open-minded and have more mature judgment than males ( Giancarlo and Facione, 2001 ). Although additional studies are necessary to confirm results from the Giancarlo study, existing research seems to indicate that changes in undergraduate critical thinking disposition are measured in years, not weeks.

In contrast to behavioral disposition, prior research indicates that critical thinking skills can be measurably changed in weeks. In their study of undergraduate critical thinking skill in university science and math courses, Quitadamo, Brahler, and Crouch (unpublished results) showed that critical thinking skills changed within 15 wk in response to Peer Led Team Learning (a national best practice for small group learning). This preliminary study provided some evidence that undergraduate critical thinking skills could be measurably improved within an academic semester, but provided no information about whether critical thinking skills could be changed during a shorter academic quarter. It was also unclear whether the development of critical thinking skills was a function of chronological time or whether it was related to instructional time.

Numerous studies provide anecdotal evidence for pedagogies that improve critical thinking, but much of existing research relies on student self-report, which limits the scope of interpretation. From the literature it is clear that, although critical thinking skills are some of the most valued outcomes of a quality education, additional research investigating the effects of instructional factors on critical thinking performance is necessary ( Tsui, 1998 , 2002 ).

Writing and Critical Thinking

Writing has been widely used as a tool for communicating ideas, but less is known about how writing can improve the thinking process itself ( Rivard, 1994 ; Klein, 2004 ). Writing is thought to be a vehicle for improving student learning ( Champagne and Kouba, 1999 ; Kelly and Chen, 1999 ; Keys, 1999 ; Hand and Prain, 2002 ), but too often is used as a means to regurgitate content knowledge and derive prescribed outcomes ( Keys, 1999 ; Keys et al., 1999 ). Historically, writing is thought to contribute to the development of critical thinking skills ( Kurfiss, and Association for the Study of Higher Education, 1988 ). Applebee (1984) suggested that writing improves thinking because it requires an individual to make his or her ideas explicit and to evaluate and choose among tools necessary for effective discourse. Resnick (1987) stressed that writing should provide an opportunity to think through arguments and that, if used in such a way, could serve as a “cultivator and an enabler of higher order thinking.” Marzano (1991) suggested that writing used as a means to restructure knowledge improves higher-order thinking. In this context, writing may provide opportunity for students to think through arguments and use higher-order thinking skills to respond to complex problems ( Marzano, 1991 ).

Writing has also been used as a strategy to improve conceptual learning. Initial work focused on how the recursive and reflective nature of the writing process contributes to student learning ( Applebee, 1984 ; Langer and Applebee, 1985 , 1987 ; Ackerman, 1993 ). However, conclusions from early writing to learn studies were limited by confounding research designs and mismatches between writing activities and measures of student learning ( Ackerman, 1993 ). Subsequent work has focused on how writing within disciplines helps students to learn content and how to think. Specifically, writing within disciplines is thought to require deeper analytical thinking ( Langer and Applebee, 1987 ), which is closely aligned with critical thinking.

The influence of writing on critical thinking is less defined in science. Researchers have repeatedly called for more empirical investigations of writing in science; however, few provide such evidence ( Rivard, 1994 ; Tsui, 1998 ; Daempfle, 2002 ; Klein, 2004 ). In his extensive review of writing research, Rivard (1994) indicated that gaps in writing research limit its inferential scope, particularly within the sciences. Specifically, Rivard and others indicate that, despite the volume of writing students are asked to produce during their education, they are not learning to use writing to improve their awareness of thinking processes ( Resnick, 1987 ; Howard, 1990 ). Existing studies are limited because writing has been used either in isolation or outside authentic classroom contexts. Factors like gender, ethnicity, and academic ability that are not directly associated with writing but may nonetheless influence its effectiveness have also not been sufficiently accounted for in previous work ( Rivard, 1994 ).

A more recent review by Daempfle (2002) similarly indicates the need for additional research to clarify relationships between writing and critical thinking in science. In his review, Daempfle identified nine empirical studies that generally support the hypothesis that students who experience writing (and other nontraditional teaching methods) have higher reasoning skills than students who experience traditional science instruction. Of the relatively few noninstructional variables identified in those studies, gender and major did not affect critical thinking performance; however, the amount of time spent on and the explicitness of instruction to teach reasoning skills did affect overall critical thinking performance. Furthermore, the use of writing and other nontraditional teaching methods did not appear to negatively affect content knowledge acquisition ( Daempfle, 2002 ). Daempfle justified his conclusions by systematically describing the methodological inconsistencies for each study. Specifically, incomplete sample descriptions, the use of instruments with insufficient validity and reliability, the absence of suitable comparison groups, and the lack of statistical covariate analyses limit the scope and generalizability of existing studies of writing and critical thinking ( Daempfle, 2002 ).

Writing in the Biological Sciences

The conceptual nature and reliance on the scientific method as a means of understanding make the field of biology a natural place to teach critical thinking through writing. Some work has been done in this area, with literature describing various approaches to writing in the biological sciences that range from linked biology and English courses, writing across the biology curriculum, and directed use of writing to improve reasoning in biology courses ( Ebert-May et al., 1997 ; Holyoak, 1998 ; Taylor and Sobota, 1998 ; Steglich, 2000 ; Lawson, 2001 ; Kokkala and Gessell, 2003 ; Tessier, 2006 ). In their work on integrated biology and English, Taylor and Sobota (1998) discussed several problem areas that affected both biology and English students, including anxiety and frustration associated with writing, difficulty expressing thoughts clearly and succinctly, and a tendency to have strong negative responses to writing critique. Although the authors delineate the usefulness of several composition strategies for writing in biology ( Taylor and Sobota, 1998 ), it was unclear whether student data were used to support their recommendations. Kokkala and Gessell (2003) used English students to evaluate articles written by biology students. Biology students first reflected on initial editorial comments made by English students, and then resubmitted their work for an improved grade. In turn, English students had to justify their editorial comments with written work of their own. Qualitative results generated from a list of reflective questions at the end of the writing experience seemed to indicate that both groups of students improved editorial skills and writing logic. However, no formal measures of student editorial skill were collected before biology-English student collaboration, so no definitive conclusions on the usefulness of this strategy could be made.

Taking a slightly different tack, Steglich (2000) informally assessed student attitudes in nonmajors biology courses, and noted that writing produced positive changes in student attitudes toward biology. However, the author acknowledged that this work was not a research study. Finally, Tessier (2006) showed that students enrolled in a nonmajors ecology course significantly improved writing technical skills and committed fewer errors of fact regarding environmental issues in response to a writing treatment. Attitudes toward environmental issues also improved ( Tessier, 2006 ). Although this study surveyed students at the beginning and the end of the academic term and also tracked student progress during the quarter, instrument validity and reliability were not provided. The generalizability of results was further limited because of an overreliance on student self-reports and small sample size.

Each of the studies described above peripherally supports a relationship between writing and critical thinking. Although not explicitly an investigation of critical thinking, results from a relatively recent study support a stronger connection between writing and reasoning ability ( Daempfle, 2002 ). Ebert-May et al. (1997) used a modified learning cycle instructional method and small group collaboration to increase reasoning ability in general education biology students. A quasi-experimental pretest/posttest control group design was used on a comparatively large sample of students, and considerable thought was given to controlling extraneous variables across the treatment and comparison groups. A multifaceted assessment strategy based on writing, standardized tests, and student interviews was used to quantitatively and qualitatively evaluate student content knowledge and thinking skill. Results indicated that students in the treatment group significantly outperformed control group students on reasoning and process skills as indicated by the National Association of Biology Teachers (NABT) content exam. Coincidentally, student content knowledge did not differ significantly between the treatment and control sections, indicating that development of thinking skill did not occur at the expense of content knowledge ( Ebert-May et al., 1997 ). Interview data indicated that students experiencing the writing and collaboration-based instruction changed how they perceived the construction of biological knowledge and how they applied their reasoning skills. Although the Ebert-May study is one of the more complete investigations of writing and critical thinking to date, several questions remain. Supporting validity and reliability data for the NABT test was not included in the study, making interpretation of results somewhat less certain. In addition, the NABT exam is designed to assess high school biology performance, not college performance ( Daempfle, 2002 ). Perhaps more importantly, the NABT exam does not explicitly measure critical thinking skills.

Collectively, it appears that additional research is necessary to establish a more defined relationship between writing and critical thinking in science ( Rivard, 1994 ; Tsui, 1998 , 2002 ; Daempfle, 2002 ). The current study addresses some of the gaps in previous work by evaluating the effects of writing on critical thinking performance using relatively large numbers of students, suitable comparison groups, valid and reliable instruments, a sizable cadre of covariables, and statistical analyses of covariance. This study uses an experimental design similar to that of the Ebert-May et al. (1997) study but incorporates valid and reliable test measures of critical thinking that can be used both within and across different science disciplines.

Purpose of the Study

Currently there is much national discussion about increasing the numbers of students majoring in various science fields ( National Research Council, 2003 ; National Academy of Sciences, 2005 ). Although this is a necessary and worthwhile goal, attention should also be focused on improving student performance in general education science because these students will far outnumber science majors for the foreseeable future. If college instructors want general education students to think critically about science, they will need to use teaching methods that improve student critical thinking performance. In many traditional general education biology courses, students are not expected to work collaboratively, to think about concepts as much as memorize facts, or to develop and support a written thesis or argument. This presents a large problem when one considers the societal role that general education students will play as voters, community members, and global citizens. By improving their critical thinking skills in science, general education students will be better able to deal with the broad scientific, economic, social, and political issues they will face in the future.

The problem addressed by this study was to discover whether writing could improve student critical thinking performance in general education biology courses. How might writing in general education biology affect the analysis, inference, and evaluation skills that are inherent to critical thinking? What level of critical thinking skill do students bring to nonmajors biology courses? Can their critical thinking skills be measurably improved using writing? What other factors affect development of critical thinking skills? When do student critical thinking skills begin to change, and how much? In this study, the effect of writing on critical thinking performance was investigated using the California Critical Thinking Skills Test (CCTST) at the beginning (pretest) and end (posttest) of 10 sections of general education biology at a regional comprehensive university in the Pacific Northwest. Several research questions framed this investigation:

Does writing in laboratory affect critical thinking performance in general education biology? Does the development of analysis, inference, and evaluation skills differ between students who experience writing versus those who experience traditional laboratory instruction? What measurable effect do factors like gender, ethnicity, and prior thinking skill have on changes in critical thinking in general education biology? If critical thinking skills change during an academic quarter, when does that take place?

MATERIALS AND METHODS

Study context.

The study took place at a state-funded regional comprehensive university in the Pacific Northwest. All participants were nonmajor undergraduates who were taking biology to satisfy their general education science requirement. Ten total sections of general education biology offered over three academic quarters (one academic year) were included in the study. Four of the 10 sections implemented a writing component during weekly laboratory meetings (N = 158); six traditional quiz-based laboratory sections served as a nonwriting control group (N = 152). Only scores from students who had completed both the initial (pretest) and end-of-quarter (posttest) critical thinking assessments were included in the data analysis. A breakdown of participant demographics for the writing and nonwriting groups is provided in Table 1 .

Demographics for the writing and nonwriting groups

Demographics profile for the study sample. n values in parentheses.

a Other includes the ″choose not to answer″ response.

Each course section included a lecture component offered four times per week for 50 min and a laboratory component that met once a week for 2 h. Course lecture sections were limited to a maximum enrollment of 48 students, with two concurrent lab sections of 24 students. Two different instructors taught five writing sections and five other instructors taught 11 traditional sections over three consecutive quarters. Each course instructor materially participated in teaching laboratory with the help of one graduate assistant per lab section (two graduate students per course section). None of the instructors from treatment sections had implemented writing in the laboratory before the start of this study. Writing instructors were chosen on the basis of personal dissatisfaction with traditional laboratory teaching methods and willingness to try something new.

Strong efforts were made to establish equivalency between writing and nonwriting course sections a priori. Course elements that were highly similar included common lecture rooms, the use of similar (in most cases identical) textbooks, and a lab facility coordinated by a single faculty member. More specifically, three similarly appointed lecture rooms outfitted with contemporary instructional technology including dry erase boards, media cabinets, a networked computer, and digital projection were used to teach the nonmajors biology courses. The same nonmajors biology textbook was used across the writing and most of the nonwriting sections. All laboratory sections used a common lab facility and were taught on the same day of the week. Although the order in which specific labs were taught differed among sections, a common laboratory manual containing prescriptive exercises covering the main themes of biology (scientific method, cellular biology and genetics, natural selection and evolution, kingdoms of life, and a mammalian dissection) was used across all writing and nonwriting lab sections.

Primary course differences included a writing component in the laboratory, and how much time was devoted to laboratory activities. Those sections that experienced the writing treatment completed the prescriptive lab exercises in the first hour and engaged in writing during the second hour of the lab. Nonwriting sections allocated 2 h for the prescriptive lab exercises and included a traditional laboratory quiz rather than a writing assignment. The degree to which the writing and nonwriting sections included small group collaboration in laboratory varied and all course sections differed with regards to individual instructor teaching style. Although all course sections used traditional lecture exams during the quarter to assess content knowledge, the degree to which rote memorization-based exam questions were used to evaluate student learning varied.

Description of the Writing Treatment

On the first day of lecture, students in the writing treatment group were told that their laboratory performance would be evaluated using collaborative essays instead of traditional quizzes. A brief overview of the writing assignments was included in associated course syllabi. During the first laboratory session of the quarter, students were grouped into teams of three or four individuals, and the criteria for completing weekly writing assignments were further explained.

The decision to use collaborative groups to support writing in the laboratory was partly based on existing literature ( Collier, 1980 ; Bruffee, 1984 ; Tobin et al., 1994 ; Jones and Carter, 1998 ; Springer et al., 1999 ) and prior research by Quitadamo, Brahler, and Crouch (unpublished results), who showed that Peer Led Team Learning (one form of collaborative learning) helped to measurably improve undergraduate critical thinking skills. Small group learning was also used in the nonwriting treatment groups to a greater or lesser extent depending on individual instructor preference.

Baseline critical thinking performance was established in the academic quarters preceding the writing experiment to more specifically attribute changes in critical thinking to the writing treatment. Concurrent nonwriting course sections were also used as comparison groups. The historical baseline provided a way to determine what student performance had been before experiencing the writing treatment, whereas the concurrent nonwriting groups allowed for a direct comparison of critical thinking performance during the writing treatment. Pretest scores indicating prior critical thinking skill were also used to further establish comparability between the writing and nonwriting groups.

Laboratory activities were coordinated for all sections by a single faculty member who taught in the nonwriting group. All faculty and graduate assistants met regularly to discuss course progress, laboratory procedure, and coordinate resources. Nonwriting faculty drafted quizzes that addressed laboratory content knowledge. Writing faculty collaboratively crafted a consensus essay, or thought question, designed to elicit student critical thinking and ability to apply content knowledge. Each thought question was designed so that students had to apply lecture concepts and build on their conceptual understanding by integrating actual laboratory experiences (see Supplemental Appendix 1 , available online) for thought question examples). Weekly thought questions became progressively more difficult as the term progressed. Initial planning meetings took place just before the beginning of the academic quarter and included graduate assistant training to help them learn to consistently evaluate student writing using a modified thesis-based essay rubric (see Supplemental Appendix 2 ; Beers et al., 1994 ). A range of sample essays from poor to high quality was used to calibrate graduate assistant scoring and ensure consistency between assistants from different laboratory sections within the writing group. All graduate assistants and course instructors applied the thesis-based rubric to sample essays and worked toward consensus. Initial training ended when all graduate assistants scored within 0.5 points of each other on at least two sample essays.

Students were given weekly thought questions before beginning laboratory to help them frame their efforts during laboratory exercises. Students completed the prescriptive lab activities during the first hour, and then each student group relocated to an assigned computer lab in the same building and worked around a common computer terminal to draft a collective response to the weekly thought question. Students were allowed to use any suitable information or materials (laboratory observations, laboratory manuals, lecture notes, textbooks, the Internet, etc.) to help them address their thought question. Internal group discussions allowed students to argue individual viewpoints as they worked toward group agreement on each thought question. Essay responses to thought questions were answered using a standard five-paragraph format. Each essay included an introduction with a group-generated thesis statement, two to three body paragraphs that provided sufficient detail to support the thesis statement, and a summary paragraph that concluded the essay. Students were not allowed to work on essays outside of the laboratory environment.

Initial essay drafts were composed in Microsoft Word and submitted to the graduate assistant by the end of the laboratory period using the campus e-mail system. Graduate assistants evaluated each group's essay (typically six per lab section) and assigned an initial grade based on the thesis-based essay rubric. Graduate assistants made comments and suggestions electronically using Microsoft Word revising and track changes tools. Evaluated essays were e-mailed back to each student group, which addressed comments and suggestions during the subsequent week's laboratory writing time. Each student group submitted a final draft that was re-evaluated and assigned a final grade. During the second week, students both revised their essay from the previous week and then generated an initial draft for the current week's thought question, all within the lab writing hour. This was done to help students become more proficient writers within a short period of time. Overall, students in the writing group completed eight essays that, along with lab book scores, constituted 25% of their overall course grade. An identical percentage was used to calculate traditional quiz and lab book scores in all nonwriting course sections.

At the end of the quarter, each writing group member completed a peer evaluation for all group members, including themselves (see Supplemental Appendix 3 ). This was done to help students reflect on and evaluate their own performance, maximize individual accountability within the group, and make sure students received credit proportional to their contributions. The average peer evaluation score for each student was included as 5% of the final course grade.

Collectively, this approach to writing and evaluation was used to 1) help students reflect on and discuss deficiencies in their collective and written work, 2) provide an opportunity for students to explicitly address deficiencies in thesis development and general writing skill, 3) provide a suitable reward for student efforts to revise their work relative to established performance benchmarks, 4) improve individual accountability within each group, and 5) help students develop more efficient and effective writing skills that collectively might lead to improved critical thinking skill.

Assessment of Critical Thinking

Using critical thinking to indicate student learning performance is particularly useful because it can be measured within and across disciplines. Various instruments are available to assess critical thinking ( Watson and Glaser, 1980 ; Ennis and Weir, 1985 ; Facione, 1990b ; Center for Critical Thinking and Moral Critique, 1996 ); however, only the CCTST measures cognitive and meta-cognitive skills associated with critical thinking, is based on a consensus definition of critical thinking, and has been evaluated for validity and reliability for measuring critical thinking at the college level ( Facione, 1990a ; Facione et al., 1992 , 2004 ). The CCTST measures cognitive skills of analysis, inference, evaluation, induction, and deduction, with results expressed as raw scores or national percentile equivalents based on a national norming sample of students from 4-yr colleges and universities. Construct validity for the CCTST is high as indicated by greater than 95% consensus of the Delphi panel experts on the component skills of critical thinking. Test reliability (calculated using the KR–20 internal consistency method) is 0.78–0.84 for the form used in this study, a value considered to be within the recommended range for tests that measure a wide range of critical thinking skills ( Facione, 1991 ). The CCTST norming sample for 4-yr colleges and universities is based on a stratified sample of 2000 students from various disciplines, with approximately 30% of the norming sample comprised of science and math students. Approximately 20,000 college students complete the CCTST each year ( Insight Assessment and Blohm, 2005 ).

The CCTST contains 34 questions and is a 45-min timed assessment of critical thinking. An online version of the CCTST was administered in this study, which allowed the researchers to collect student demographics data including gender, ethnicity, age, and several others at the same time critical thinking skill was measured. Total critical thinking skill as well as analysis, inference, and evaluation component critical thinking skills ( Facione, 1990c ) were determined for each CCTST administration and compared across the writing and nonwriting groups.

Research Design

A quasi-experimental pretest/posttest control group design was used for this study to determine whether critical thinking performance in the writing group differed significantly from the nonwriting group. This design was chosen in order to compare critical thinking performance between intact groups, and because it was not feasible to randomly assign students from one course section to another within the sample. Frequency distributions of pretest/posttest changes in total critical thinking skill and analysis, inference, and evaluation component critical thinking skills were constructed to provide some indication of sample randomness and to inform assumptions for subsequent statistical analyses of covariance (see Figure 1 , A–D).

(A–D) Frequency distribution of change in critical thinking skills. Distribution of change in critical thinking skill for the experimental sample. Changes are indicated using raw scores from CCTST pre- and posttests for total critical thinking skill (A) as well as analysis (B), inference (C), and evaluation (D) component critical thinking skills.

The pretest/posttest control group design was also used in order to minimize internal validity threats that could potentially compete with the effects of the writing treatment on student critical thinking performance. This design is widely used in educational research, and generally controls for most threats to internal validity ( Campbell and Stanley, 1963 ). Internal threats that remain a concern include history, maturation, pretest sensitization, selection, and statistical regression toward the mean. In the current study, history and maturation threats were minimized to the extent that the CCTST pretest and posttest were administered only 9 wk apart, and class standing and age covariables that indicate maturation were included in the statistical analysis. Pretest sensitization and selection are larger concerns for this design. Pretest sensitization was minimized in several ways: 1) prior critical thinking skill indicated by the CCTST pretest was used as a covariable in statistical analyses, 2) pretest/posttest to posttest only comparison studies conducted by Insight Assessment indicate CCTST pretest sensitization is minimized ( Facione, 1990a ), and 3) neither the students, instructors, nor the test administrators have access to the correct answers on the CCTST, so repeat performance on the posttest is less likely. Selection threats were also reduced by using CCTST pretest scores in the statistical analyses, thereby making it more difficult to detect statistically significant differences in critical thinking performance between the writing and nonwriting groups. Statistical regression toward the mean, which was observed to some extent in this study, was minimized because this study used a valid and reliable instrument to assess critical thinking ( Facione, 1990a ). Regression threats were also minimized to the extent that students with higher initial scores regressed much less than students with lower initial scores.

The generalizability of study results is limited because all data were collected at a single university. Specific threats to external validity include selection-treatment interaction and treatment diffusion. These threats were minimized because writing was mandatory for all treatment group participants, thereby minimizing volunteer effects. Because the writing also took considerable student effort, it is less likely that treatment diffusion occurred. In summary, the pretest/posttest control group design was used to minimize internal and external validity threats and maximize the ability to determine the effects of writing on student critical thinking performance.

Study Variables and Data Analysis

Effect of writing on critical thinking performance..

General education biology students were divided into writing and nonwriting groups (independent variable). Changes in CCTST pretest/posttest scores (dependent variable) were determined to discover whether writing influenced student critical thinking performance. Two CCTST outcome measures were used to statistically test for writing effect: 1) raw scores for total critical thinking skill, and 2) raw scores for analysis, inference, and evaluation component skills. Results were reported using raw scores and corresponding national percentile rank so that critical thinking performance outcomes would be more meaningful and intuitive. Conversion of CCTST raw scores to national percentile ranking was done using SPSS (SPSS, Inc., Chicago, IL) statistical software and a linear estimation conversion script based on an equivalency scale from Insight Assessment (Millbrae, CA).

Several covariables were included in the analysis to increase statistical accuracy and precision, and to more specifically isolate the effects of writing on critical thinking performance. CCTST pretest scores were used to indicate initial critical thinking skill. Gender and ethnicity helped to account for male/female or race-specific changes in critical thinking performance and were also used to identify potential sources of performance bias. Academic term and time of day were used to account for critical thinking differences due to the time of year each course was offered and the time of day each student took the course, respectively. Class standing and age were used to indicate maturation related to time in college and chronological age, respectively. Finally, the instructor covariable was used to account for performance differences due to individual teaching styles.

Statistical Analysis of Effect of Writing.

Several statistical analyses were conducted to determine the effects of writing on critical thinking performance in general education biology. An analysis of covariance (ANCOVA) test provided insight regarding differences in overall critical thinking performance between the writing and nonwriting groups. Change in CCTST total raw scores and national percentile ranking was used as composite measures of critical thinking ( Facione, 1990c ) in this initial analysis. Second, changes in particular component critical thinking skills (analysis, inference, and evaluation) were evaluated using a multivariate analysis of covariance (MANCOVA) test because of the three dependent variables. The ANCOVA and MANCOVA tests also provided some insight into the effect the covariables had on critical thinking performance in general education biology. Collectively, these statistical tests allowed for a more accurate and precise analysis because variance associated with the covariables could be more specifically isolated from the writing treatment. Mean, SE, and effect size were also compared between the writing and nonwriting groups. Effect size, represented in standard units, was used to compare the magnitude of writing effect in the study.

Analysis of Thought Question Performance.

Performance on weekly thought questions was analyzed to discover specifically when and how much student critical thinking skills changed during the academic term. This analysis also provided context for CCTST critical thinking performance measures. Specifically, average scores from a representative sample of writing course sections (approximately 100 students) were used to compare initial essay drafts across the weeks of the term to discover when students began to show changes in their first attempt at each essay. Weekly performance on final revised essays was also compared to determine how student final submissions changed over time. Finally, the weekly difference between each initial essay and each final essay was compared to determine how much the revision process changed during the term. These calculations collectively helped to provide a profile of critical thinking performance over time.

Participant Demographics

Student demographics provided in Table 1 indicated an overall distribution of approximately 49% freshmen, 31% sophomores, 11% juniors, and 9% seniors. Approximately 74% of the writing group students were freshmen and sophomores, whereas 82% of the nonwriting group was underclassmen. Overall, 61% of the sample was female and 39% male, with near identical gender distribution across the writing and nonwriting groups. The predominant ethnicity in the sample was Caucasian (>83%), with Asian American (5%), Latino/Hispanic (3%), African American (2%), and Native American (1%) students comprising the remainder of the sample. About 6% of the sample classified themselves as having some other ethnicity or chose not to identify their ethnic heritage.

Statistical Assumptions

Analysis of covariance and multivariate analysis of covariance tests were used to compare critical thinking performance between the writing and nonwriting groups. The evaluated assumptions for the ANCOVA and MANCOVA tests were homogeneity of slopes, homogeneity of covariances, and normality. An analysis evaluating the homogeneity of slopes assumption indicated that the relationship between the covariables and the critical thinking performance dependent variable did not differ significantly by the writing/nonwriting independent variable for the ANCOVA test, F(2, 307) = 1.642, p = 0.195, power = 0.346, partial η 2 = 0.011, or the MANCOVA test, F(6, 610) = 1.685, p = 0.122, power = 0.645, partial η 2 = 0.016. These results confirmed that both analyses of covariance met the homogeneity of slopes assumption. The homogeneity of covariance assumption was tested using Levene's and Box's tests. Levene's test results for the ANCOVA indicated that error variances were not equal across writing and nonwriting groups, F(1,308) = 7.139, p = 0.008. Similarly, Box's test results indicated that covariance was not equal for the writing and nonwriting groups, F(6, 684,530) = 4.628, p = 0.000. These results indicated that the ANCOVA/MANCOVA tests did not meet the homogeneity of covariance assumption. To more fully evaluate this assumption, distributions of total and component critical thinking skill were constructed (see Figure 1 , A–D). Furthermore, the writing and nonwriting groups were highly similar in size and no post hoc tests were conducted. On the basis of these data, it was determined that the ANCOVA and MANCOVA tests were the best statistical measures to answer the research questions. Finally, the normality assumption was evaluated using the previously constructed frequency distributions for total change in critical thinking ( Figure 1 A) as well as change in analysis ( Figure 1 B), inference ( Figure 1 C), and evaluation ( Figure 1 D) critical thinking skills. Frequency distributions of total and component critical thinking dependent variables indicated that each approximated a standard normal curve.

Effect of Writing on Total Critical Thinking Performance

The ANCOVA test of total critical thinking performance showed that writing and nonwriting groups differed significantly, F(1, 300) = 19.357, p < 0.0001, power = 0.992, partial η 2 = 0.061 (see Table 2 ). The strength of the relationship between the writing/nonwriting groups and critical thinking performance was modest but significant, accounting for more than 6% of the variance in critical thinking performance.

ANCOVA results for total critical thinking performance

Analysis of covariance for the writing and nonwriting groups. Tested covariables included gender, ethnicity, class standing, age, prior critical thinking skill (CCTST pre-test), academic term, time of day, and instructor.

a Significance tested at 0.05 level.

Descriptive statistics of total critical thinking performance in the writing and nonwriting groups were also calculated (see Table 3 ). The writing group showed an average CCTST raw score change of 1.18 compared with the nonwriting group, which showed an average raw score change of −0.51. These critical thinking raw scores equated to gains in national percentile rank of 7.47 (45th to 53rd percentile) for the writing group and −2.09 (42nd to 40th percentile) for the nonwriting group. Critical thinking improvement in the writing group was approximately nine times greater than the nonwriting group (see Figure 2 ).

Writing effect on total critical thinking performance: CCTST raw scores

Comparison of writing and nonwriting group performance based on CCTST raw scores. CCTST raw score range was 0–34; n values in parentheses.

Effect of writing on total critical thinking national percentile rank. Comparison of total critical thinking national percentile gains between writing and nonwriting groups. Percentile ranking was computed using CCTST raw scores, an equivalency scale from Insight Assessment, and a linear conversion script in SPSS.

The ANCOVA test of total critical thinking skill indicated that gender, ethnicity, age, class standing, and academic term did not significantly affect critical thinking performance (see Table 2 ). Covariables that significantly affected total critical thinking performance included 1) CCTST pretest score, F(1, 300) = 19.713, p < 0.0001, power = 0.993, partial η 2 = 0.062, 2) instructor, F(1, 300) = 7.745, p < 0.006, power = 0.792, partial η 2 = 0.025, and 3) time of day, F(1300) = 6.291, p < 0.013, power = 0.705, partial η 2 = 0.021. The effect of prior critical thinking skill (CCTST pretest) was moderately strong, accounting for more than 6% of the variance in total critical thinking performance. The effect of instructor and time of day were smaller, accounting for 2.5 and 2%, respectively, of total critical thinking performance variance. Critical thinking improvement associated with CCTST pretest score was approximately 2.5 times greater than for instructor and nearly three times greater than for time of day.

Effect of Writing on Component Critical Thinking Performance

The MANCOVA test indicated that analysis, inference, and evaluation critical thinking skills differed significantly between the writing and nonwriting groups, Wilks λ = 0.919, F(3, 296) = 8.746, p < 0.0001, power = 0.995, partial η 2 = 0.081 (see Table 4 ). The strength of the relationship between writing and component critical thinking performance was modest but significant, accounting for more than 8% of the variance in critical thinking performance.

MANCOVA results for component critical thinking performance

Multivariate analysis of covariance for the writing and nonwriting groups. Tested covariables included gender, ethnicity, class standing, age, prior critical thinking skill (CCTST pretest), academic term, time of day, and instructor.

Specifically, significant gains in analysis and inference skills were observed in the writing group but not the nonwriting group. No statistically significant gains in evaluation skill were observed in either group (see Table 5 ). National percentile rank equivalents for CCTST component raw scores indicated the writing group gained 10.51 percentile in analysis skill (42nd to 52nd percentile), 6.05 percentile in inference skill (45th to 52nd percentile), and 5.16 percentile in evaluation skill (46th to 52nd percentile). The nonwriting group showed a national percentile rank change of −4.43 percentile in analysis skill (47th to 42nd percentile), −2.23 percentile in inference skill (42nd to 40th percentile), and 1.37 percentile in evaluation (44th to 45th percentile; see Figure 3 ). Critical thinking performance for the writing group was 15 times greater for analysis and 8 times greater for inference skills than for the nonwriting group. Although neither the writing nor the nonwriting group showed significant gains in evaluation skill, the writing group showed more than 3 times greater improvement than did the nonwriting group.

Effect of writing on component critical thinking performance

Comparison of writing and nonwriting group performance based on critical thinking component skill raw scores (CCTST subscales). Score range was 0–7 (analysis), 0–16 (inference), and 0–11 (evaluation).

Effect of writing on component critical thinking national percentile rank. Comparison of component critical thinking national percentile gains between writing and nonwriting groups. Percentile ranking was computed using CCTST raw scores, an equivalency scale from Insight Assessment, and a linear conversion script in SPSS.

The MANCOVA test of analysis, inference, and evaluation skills indicated that gender, ethnicity, age, class standing, academic term, and time of day did not significantly affect critical thinking performance. Critical thinking performance was affected by prior analysis, inference, and evaluation skill (CCTST component pretest scores) and instructor (see Table 4 ). Specifically, component pretest scores had a large effect on critical thinking, accounting for 38% (analysis), 32% (inference), and 39% (evaluation) of critical thinking performance variance. The effect of instructor was smaller, accounting for 4.4% of variation in critical thinking skill. The effect of prior component critical thinking skill was approximately 4.5 times greater than the effect of writing, and nearly 9 times greater than the effect of instructor.

Student Thought Question Performance

Critical thinking performance on student essays was evaluated by applying a thesis-based essay rubric (see Supplemental Appendix 2 ) on initial submissions and final revised essays. Average weekly performance during the academic term is shown in Figure 4 . A comparison of initial essays indicated that students improved 53.3% from week 1 (average score of 27.9%) to week 7 (average score of 81.2%). A similar comparison of final essays showed that students improved 32.5% from week 1 (average score of 54.1%) to week 7 (average score of 86.6%). The largest changes between initial and final essays occurred in week 1 (change of 26.2%), and decreased each week thereafter (24.8, 23.9, 18.8, 8, 7.8, and 5.4% for weeks 2 through 7, respectively). These results showed that students produced little evidence of critical thinking skill in their writing early in the term, but improved dramatically on both initial and revised essay submissions by the end of the term.

Profile of change in critical thinking performance in writing group. Comparison of student writing performance on weekly initial and revised essays. Essay scores were derived using a thesis-based critical thinking rubric (see Supplemental Appendix 2 ). Average essay scores were computed across writing sections.

The purpose of this study was to discover whether writing could measurably influence critical thinking performance in general education biology. Results indicated that students from the writing group significantly outperformed their nonwriting peers in both total critical thinking skill and the component critical thinking skills of analysis and inference. The writing and nonwriting groups were highly similar initially and began the academic term with comparable critical thinking ability (45th and 42nd national percentile for writing and nonwriting, respectively). By the end of the term, writing students had improved their critical thinking skill to above the 52nd percentile whereas nonwriting students decreased to below the 40th percentile. In addition to writing, prior critical thinking skill and course instructor significantly affected critical thinking performance, with prior critical thinking skill having the largest effect on critical thinking gains of any variable tested. Further analysis of the writing group showed that the largest gains in critical thinking occurred during the first few weeks of the term, with graduated improvement during the remainder of the term. A comparison of average critical thinking performance on initial essays and revised essays showed that thinking skills improvement was greater on initial essays (53%) than on final essays (33%). Collectively, the results of this study indicated that students who experienced writing in general education biology significantly improved their critical thinking skills.

The covariance analysis that was conducted provided a partial means to separate out the effects of writing, prior critical thinking skill, instructor, and multiple covariables from total and component critical thinking gains. The analysis of total critical thinking skill indicated that writing students changed their critical thinking skill from below the national average to above the national average within an academic quarter, whereas nonwriting students remained below the national average. This observation is important because it shows that students can develop critical thinking skills within a fairly short 9-wk period of time, and that writing can play a role in that process. A similar study showed critical thinking skills improve over 15 wk (Quitadamo, Brahler, and Crouch, unpublished results); however, this study provided no insight into whether critical thinking skills could be changed over a shorter period of time, in a different academic setting, or in response to instructional variables such as writing.

Although critical thinking gains were influenced by writing, they did not appear to be affected by gender, ethnicity, class standing, or age. In fact, statistical results indicated that these variables collectively had a very small effect on critical thinking performance. Gender distribution was nearly identical across the writing and nonwriting groups, and was predominantly female (nearly 62%). Ethnic distribution was also highly similar across the writing and nonwriting groups, but the sampling was largely Caucasian (>84%). Class standing varied a little more across the writing and nonwriting groups, with the sample largely comprised of underclassmen (70%). Although nearly three-quarters of the sample was between 18 and 21 years of age, nearly 10% was over 21, with a fair number of older nontraditional students represented. It is possible that a more diverse sample would have produced different results, or it may be that the individuals participating in this study responded particularly well to writing. Although further investigation of these variables is necessary and important, it was beyond the scope of the current study.

The analysis of component skills provided greater insight into the particular critical thinking skills that students changed in response to writing. Specifically, writing students significantly improved their analysis and inference skills whereas nonwriting students did not. Writing students also improved their evaluation skills much more than nonwriting students, although not significantly. These results indicate that the process of writing helps students develop improved analytical and inference skills. Prior research indicates that the writing to learn strategy is effective because students must conceptually organize and structure their thoughts as well as their awareness of thinking processes ( Langer and Applebee, 1987 ; Ackerman, 1993 ; Holliday, 1994 ; Rivard, 1994 ). More specifically, as students begin to shape their thoughts at the point of construction and continually analyze, review, and clarify meaning through the processes of drafting and revision, they necessarily engage and apply analysis and inference skills ( Klein, 1999 ; Hand and Prain, 2002 ). In this study, the process of writing appears to have influenced critical thinking gains. It also seems likely that writing students experienced a greater cognitive demand than nonwriting students simply because the writing act required them to hypothesize, debate, and persuade ( Rivard, 1994 ; Hand and Prain, 2002 ) rather than memorize as was the case in nonwriting control courses.

Conversely, the lack of any significant change in analysis, inference, or evaluation skills in the nonwriting group indicated that the traditional lab instruction used in the general education biology control courses did not help students develop critical thinking skills. Based on the results of this study, it could be argued that traditional lab instruction actually prevents the development of critical thinking skills, which presents a rather large problem when one considers how frequently these traditional methods are used in general education biology courses. One also has to consider that the critical thinking gains seen in the writing group might also have resulted from the relative absence of traditional lab instruction rather than writing alone. Additional research will be necessary to gain further insight into this question. Either way, changes to the traditional model of lab instruction will be necessary if the goal is to enhance the critical thinking abilities of general education biology students.

The variable that had the largest impact on critical thinking performance gains was prior critical thinking skill. This phenomenon was previously observed by Quitadamo, Brahler, and Crouch (unpublished results) in a related study that investigated the effect of Peer Led Team Learning on critical thinking performance. That study focused on science and math major undergraduate critical thinking performance at a major research university, and found that, in addition to Peer Led Team Learning, prior critical thinking skill significantly influenced critical thinking performance (Quitadamo, Brahler, and Crouch, unpublished results). Specifically, students with the highest prior critical thinking skill showed the largest performance gains, whereas students with low initial skill were at a comparative disadvantage. The fact that prior critical thinking skill also had a large effect on critical thinking performance in this study increases the generalizability of the observation and underscores its importance. Simply put, students who have not been explicitly taught how to think critically may not reach the same potential as peers who have been taught these skills, not because they lack the cognitive hard-wiring to perform but because they lack the tools to build their knowledge. Is it reasonable or just to expect otherwise comparable students to perform at similar levels when only some of them have the keys for success? If we hope to improve the perception of science in this country, we need to educate people on how to think about important scientific issues, and not simply argue a position based on one school of thought. By helping general education students to develop critical thinking skills, it is hoped that they will be better able to think rationally about science.

The observation that students who come to general education biology with greater critical thinking skills leave with the largest skill gains has important implications for the K–12 school system as well. If a high proportion of students are coming to institutions of higher education lacking critical thinking skills, why are these skills not being explicitly taught in the K–12 system? Ideally, students would learn the foundational tenets of critical thinking at an earlier age, and be able to refine and hone these skills as they progress through the K–20 education system. The results of this study reinforce the idea that students should be explicitly taught critical thinking skills and be expected to practice them as early and often as possible.

Although its effect was smaller than writing or prior critical thinking skill, the instructor variable also played a significant role in student critical thinking performance, accounting for 2.5% of the total variance in critical thinking gains. Determining the particular qualities of each instructor that contributed to student critical thinking success and further separating instructor and writing effects will require additional research. Previous research indicates that teaching style positively influences certain aspects of student learning ( Grasha, 1994 ; Hativa et al., 2001 ; Bain, 2004 ), but the qualities that specifically influence student critical thinking gains have not been sufficiently investigated. Additional research in this area is necessary.

Faculty considering whether to use writing in the laboratory may wonder about how much time and energy it takes to implement, if efforts to change will translate into improved student learning, and how these changes affect disciplinary content. From a practical perspective, implementing writing did not take more time and effort per se; rather, it required faculty to reconceptualize how they spent their instructional time. Instead of individually developing course materials, writing faculty collaborated to a greater extent than nonwriting faculty on course design and assessments that required students to demonstrate their critical thinking skill. Interviews of faculty from the writing and nonwriting groups indicated that writing faculty felt the course was less work because they collaborated with colleagues and because students demonstrated improved thinking skill. Writing faculty generally became more comfortable with the new model after ∼2–3 wk when students began to show observable changes in writing proficiency and critical thinking. Together, collaboration with colleagues and observed gains in critical thinking tended to create a positive feedback loop that helped to sustain writing faculty efforts. In contrast, nonwriting faculty similarly wanted their students to think better but were convinced that traditional methods would be more effective, and so remained closed to change. There were some logistical challenges with writing, like scheduling computer labs where students could draft and revise their weekly essay responses under instructor and teaching assistant supervision. Teaching assistants (and faculty) also needed to be trained on how to evaluate writing using a rubric. Finally, with regards to content coverage, no lecture or laboratory content was killed in order to implement writing because writing and nonwriting students both performed the same lab activities. Collectively, the benefits of using writing in laboratory should encourage faculty who want their students to learn to think critically to give it a try.

Future Directions

This study showed that writing affects student critical thinking skill in a nonmajors biology course, but the results have generated more questions than have been answered. How does writing specifically produce gains in critical thinking performance? What factors influence student prior critical thinking skill? How do instructors specifically influence student gains in critical thinking? Future studies that analyze student essays in more detail would provide greater insight into how writing influences critical thinking skill. Using writing in other nonmajor science courses such as chemistry, geology, or physics could also be done to determine the transferability of this method. Additional studies that investigate student prior critical thinking skill and instructor variables are also necessary. These future studies would further contribute to the knowledge base in this area, and also address some of its identified limitations ( Ebert-May et al., 1997 ; Daempfle, 2002 ). Results from these studies would also increase the generalizability of the results from this study.

CONCLUSIONS

Building on existing research and on the basis of several lines of evidence presented in this study, we conclude that writing positively influences critical thinking performance for general education biology students. Those students with prior critical thinking skill may have a comparative advantage over other general education biology students who have not developed these same skills. To rectify that inequity critical thinking skills should be explicitly taught early and used often during the K–20 academic process. As it appears that particular instructors improve student critical thinking skills more than others, students should be discerning in their choice of instructors if they want to improve their critical thinking skills. Whether writing as a method to improve critical thinking skills will prove useful in other general education science courses will likely depend on a host of factors, but it has potential. Further study of writing in general education science will be necessary to verify these results and discover the breadth and depth of how writing affects critical thinking skill.

ACKNOWLEDGMENTS

We thank Drs. Holly Pinkart, Roberta Soltz, Phil Mattocks, and James Johnson and undergraduate researchers Matthew Brewer, Dayrk Flaugh, Adam Wallace, Colette Watson, Kelly Vincent, and Christine Weller for their valuable contributions to this study. The authors also acknowledge the generous financial support provided by the Central Washington University Office of the Provost and the Office of the Associate Vice President for Undergraduate Studies.

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