how to defend phd viva

The Savvy Scientist

Experiences of a London PhD student and beyond

How to Defend a Thesis: An Introduction to the PhD Viva

The prospect of defending your PhD work can be more than a little daunting. It represents the climax of many years of hard work, you’ll have to defend a thesis in front of experts in your field and the whole PhD viva process can seem cloaked in mystery.

Maybe you’ve seen a labmate go for their PhD viva to then emerge several hours later, relieved but perhaps slightly dazed. Often it’ll be the case that they’ll have forgotten the specifics by the time they’ve left the room. On top of that, horror stories of bad PhD viva experiences pass through many research groups which are enough to make even the most confident and positive PhD students shake in their boots.

Having had my own PhD viva earlier this year, in addition to discussing experiences with many other PhD graduates, I now want to help you through the process.

Before we begin, I want to offer some reassurance. For most people the PhD viva is not at all the horrible experience we occasionally hear about. Even so, it’s still useful to know what to expect. I’ve therefore put together a series to help others understand the PhD viva process and how to defend a thesis.

Defend a Thesis: Overview of the PhD Viva Series

This first post will be an introduction to the PhD viva process and how to defend a thesis. Upcoming posts will cover:

• Viva Preparation: Common PhD Viva Questions
• What is a PhD Viva Like? Sharing Graduates’ Experiences
• How to Choose Your Examiners

If there is anything specific you’d like covered, please let me know! I’ll be sure to include it. If you’d like to subscribe to get notified of upcoming posts as they’re released you can do so here:

How is a PhD Assessed?

Typically the main output expected at the end of your PhD project is a thesis. You’ve put years of work into your PhD and the thesis details your contributions to your chosen research field. But how is the thesis “marked”? Who will decide if what you’ve written is actually any good?

This is where the PhD viva comes in!

The PhD viva involves you discussing and defending your work with experts in your field. The experts act as examiners to determine whether or not the university should award you a PhD based on your thesis and viva performance. The thesis is the written report submitted for a PhD, and the viva is a means of quality control to ensure that only suitable candidates are awarded a PhD by the university.

Although part of the purpose of a PhD viva is to ensure that the work is of a high quality, just as importantly it’s to check that you were the one who carried it out and that you understand what you were doing!

The PhD viva is therefore essentially an exam during which you’ll have to defend a thesis.

Here is the official “mark scheme” for a PhD at Imperial:

I recommend looking at the presentation which this screenshot came from: sadly I only came across it after my own PhD viva whilst putting together this post!

Steps to Completing a PhD

• Submit your thesis for the examiners to read ahead of the viva.
• Have the viva , where you’ll defend a thesis and discuss your research. The examiners will decide from a list of possible outcomes as detailed later in this post.
• Make amendments to the thesis as necessary.
• Optional celebration.
• Have the thesis amendments approved by the examiners and/or your supervisor and confirmation sent to the university.
• Upload the final copy of your thesis to the university.
• Eagerly await notification that you’ve been awarded a PhD by the university!
• Celebrate, Dr!

All celebrations except for the one after making changes to your thesis are mandatory!

PhD Viva vs PhD Defence

The words viva and defence are sometimes used interchangeably, but often are used to reference the different ways that the a PhD is concluded around the world.

A PhD viva (technically a viva voce ) is a formal examination of a PhD. It’s typical in the UK (amongst other countries) and it is a closed-event between yourself and some examiners.

Across much of Europe it is common instead to have a PhD defence . This still involves expert questioning but can be more of a ceremony and may even be open to the public. You can read about Siddartha’s experience , who completed his PhD in the Netherlands.

I went through a PhD viva and that’ll be the focus of this series. Nevertheless, there is overlap and you may still have difficult questions in a PhD defence, so the content in this series should still be useful no matter where you’re based.

In both a PhD viva and a PhD defence you’ll be expected to defend a thesis which represents the culmination of your work during the PhD.

Who is Present During the PhD Viva?

In the UK it is typical for the PhD viva to include:

• One or more experts from your university ( internal examiner ).
• One or more experts in your field from another institution to your own ( external examiner ).
• And sometimes your supervisor, though in my experience this is quite rare unless you actively ask them to be there.

The main role of the internal examiner is to act as a moderator and ensure that the university’s protocols are upheld. They’ll usually still have some questions for you, but on top of that they’ll make sure that the external examiner(s) are reasonable. They will also take charge of documenting the viva.

Often the external examiner will be more specialised to your field than the internal examiner, so expect them to potentially ask more tricky and technical questions.

As mentioned in the previous section, for PhD defences in other countries the event may be less of an exam (viva) and more of a celebration of your work. These can be a lot more open, with access granted to your friends, family or anyone else who is interested in the topic. I quite like this idea, especially when the research has been publicly funded!

How the PhD Viva is Structured

The structure of the viva will vary but a typical format is shown below. The times in brackets are how long the sections for my own viva were, thankfully not all vivas are over five hours long!

• Introductions (2 minutes) – greeting the examiners and they’ll usually quickly give an overview for how they want the viva to go.
• Presentation (10 minutes) – Not all examiners will want you to give a presentation, it’s best to ask them in advance. I believe many examiners like asking for presentations: both to ease into the exam and also to see how you do at distilling years of work into a short presentation.
• Discussion (Over 5 hours, yes, really!) – the long and potentially scary bit.
• A short break (~10 minutes) . You’ll leave the room (or video call!) and the examiners will come to a decision for your PhD outcome.
• Decision and final comments (10 minutes) – where the examiners will tell you what the outcome is of the viva – we’ll cover this in more depth in the next section.

The discussion in the middle of course is the main guts of the PhD viva, and the potentially scary bit. This is where you’ll get questioned about your work and thesis. What you get asked could vary considerably depending on your thesis and examiners.

I’ll save an in-depth discussion of my own viva for another post. In short, I received very few questions relating to the work or any fundamental underlying science. There were practically no questions to quiz my knowledge.

Rather than checking my understanding of the work, the viva was much more of a discussion of how best to present the work in the thesis. We spent roughly an hour going page by page through each chapter. This included suggestions for improvements to figures, changes in terminology and the like.

Possible PhD Viva Outcomes

At the end of the viva the examiners will give you feedback. This will include feedback on your performance in the viva. But as long as they’re satisfied that you carried out the work and that you knew what you’re doing, the bulk of the feedback will in fact revolve around your PhD thesis.

Technically there are lots of potential outcomes, as detailed here:

In reality here are the four main possible outcomes from the viva:

• Pass with no amendments . The examiners didn’t want to make a single alteration to your thesis. Well done you just have to submit the finalised thesis to the university and you’ve finished your PhD! I know a few people who’ve had no revisions but it’s rare.
• Pass with minor amendments Minor amendments include things such as correcting typos, rewording sentences and small alterations to data analysis and presentation. This is by far the most common outcome.
• Referral for resubmission ( major amendments). More substantial changes to the thesis are required or further experimental work is required to fulfil the requirements of a PhD. The examiners will decide whether or not this means having another viva too.
• Fail . Unless there are glaring issues or you didn’t actually do any of the research in your thesis yourself, you should be relieved to hear that practically no one ever fails. If you have failed, it usually points to systematic issues revolving around your supervisor: you shouldn’t have been allowed to get to this point. Usually the examiners would recommend that you be awarded a lower degree, such as a masters in research (MRes).

Slightly up the page is a screenshot from my own examiners’ report. You’ll see that I, like most people, passed with minor amendments.

2022 Update: Starting to prepare for your PhD viva? A set of viva preparation worksheets are now available in the resource library. Click the image below for free access!

Making Changes to Your PhD Thesis

Shortly after the viva you should receive the examiner’s report which includes a list of revisions for you to make.

If you’ve got through the viva with a pass, you can breathe a sigh of relief because the hard work is over! In a separate post I’ll be covering how the process to make my own minor amendments went.

No matter the outcome, it is possible that you’d like to make your own changes to the thesis since it’ll have been many weeks (or months) since submitting the draft copy for your viva. On reflection there may be things you’re not happy with. You are welcome to make changes to the document yourself.

If you’re interested in reading more about how to make the corrections to your thesis, read the article dedicated to it here: Minor Corrections: How To Make Them and Succeed With Your PhD Thesis.

After you’ve made changes, the final stage in getting awarded the PhD is submitting your finalised version of the thesis to the university. Shortly afterwards you’ll get the long-awaited notification that you’ve got your PhD!

Should You Strive For No Amendments?

In my opinion it’s not worth the effort of trying to get no amendments.

I’d personally rather spend slightly less time up front, knowing that more than likely I would have to made some amendments. You can never put in enough work to ensure there will be nothing your examiners want changed!

You could spent hundreds of extra hours endlessly going through your thesis meticulously before submission but your examiners can always find something they want you to change. In comparison, my own minor amendments only took two days of work.

Sometimes you’ll see someone mention on their CV that they passed with no revisions but it doesn’t really have any bearing on your PhD. Unlike most other qualifications, there aren’t really grades for PhDs: you either have one or you don’t.

During an early PhD assessment my assessor made a poignant joke about medical degrees: “What do you call the person who graduates bottom of their class in medical school? A doctor!” And it’s essentially the same with PhDs!

If you’d like personalised help with preparing for your PhD viva I am now starting to offer a small number of one-to-one sessions. Please contact me to find out more or click here to book a call.

I hope this introduction to PhD vivas and how to defend a thesis has been useful. Let me know if you have any specific questions or concerns you’d like to see addressed in the following posts.

As always you can stay up to date with content by subscribing here:

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Preparing For Your Dissertation Defense

13 Key Questions To Expect In The Viva Voce

By: Derek Jansen (MBA) & David Phair (PhD) . Reviewed By: Dr Eunice Rautenbach | June 2021

Preparing for your dissertation or thesis defense (also called a “viva voce”) is a formidable task . All your hard work over the years leads you to this one point, and you’ll need to defend yourself against some of the most experienced researchers you’ve encountered so far.

It’s natural to feel a little nervous.

In this post, we’ll cover some of the most important questions you should be able to answer in your viva voce, whether it’s for a Masters or PhD degree. Naturally, they might not arise in exactly the same form (some may not come up at all), but if you can answer these questions well, it means you’re in a good position to tackle your oral defense.

Viva Voce Prep: 13 Essential Questions

• What is your study about and why did you choose to research this in particular?
• How did your research questions evolve during the research process?
• How did you decide on which sources to include in your literature review?
• How did you design your study and why did you take this approach?
• How generalisable and valid are the findings?
• What were the main shortcomings and limitations created by your research design?
• How did your findings relate to the existing literature?
• What were your key findings in relation to the research questions?
• Were there any findings that surprised you?
• What biases may exist in your research?
• How can your findings be put into practice?
• How has your research contributed to current thinking in the field?
• If you could redo your research, how would you alter your approach?

#1: What is your study about and why did you choose to research this in particular?

This question, a classic party starter, is pretty straightforward.

What the dissertation or thesis committee is assessing here is your ability to clearly articulate your research aims, objectives and research questions in a concise manner. Concise is the keyword here – you need to clearly explain your research topic without rambling on for a half-hour. Don’t feel the need to go into the weeds here – you’ll have many opportunities to unpack the details later on.

In the second half of the question, they’re looking for a brief explanation of the justification of your research. In other words, why was this particular set of research aims, objectives and questions worth addressing? To address this question well in your oral defense, you need to make it clear what gap existed within the research and why that gap was worth filling.

#2: How did your research questions evolve during the research process?

Good research generally follows a long and winding path . It’s seldom a straight line (unless you got really lucky). What they’re assessing here is your ability to follow that path and let the research process unfold.

Specifically, they’ll want to hear about the impact that the literature review process had on you in terms of shaping the research aims, objectives and research questions . For example, you may have started with a certain set of aims, but then as you immersed yourself in the literature, you may have changed direction. Similarly, your initial fieldwork findings may have turned out some unexpected data that drove you to adjust or expand on your initial research questions.

Long story short – a good defense involves clearly describing your research journey , including all the twists and turns. Adjusting your direction based on findings in the literature or the fieldwork shows that you’re responsive , which is essential for high-quality research.

#3: How did you decide on which sources to include in your literature review?

A comprehensive literature review is the foundation of any high-quality piece of research. With this question, your dissertation or thesis committee are trying to assess which quality criteria and approach you used to select the sources for your literature review.

Typically, good research draws on both the seminal work in the respective field and more recent sources . In other words, a combination of the older landmark studies and pivotal work, along with up-to-date sources that build on to those older studies. This combination ensures that the study has a rock-solid foundation but is not out of date.

So, make sure that your study draws on a mix of both the “classics” and new kids on the block, and take note of any major evolutions in the literature that you can use as an example when asked this question in your viva voce.

#4: How did you design your study and why did you take this approach?

This is a classic methodological question that you can almost certainly expect in some or other shape.

What they’re looking for here is a clear articulation of the research design and methodology, as well as a strong justification of each choice . So, you need to be able to walk through each methodological choice and clearly explain both what you did and why you did it. The why is particularly important – you need to be able to justify each choice you made by clearly linking your design back to your research aims, objectives and research questions, while also taking into account practical constraints.

To ensure you cover every base, check out our research methodology vlog post , as well as our post covering the Research Onion .

#5: How generalizable and valid are the findings?

This question is aimed at specifically digging into your understanding of the sample and how that relates to the population, as well as potential validity issues in your methodology.

To answer question this well, you’ll need to critically assess your sample and findings and consider if they truly apply to the entire population, as well as whether they assessed what they set out to. Note that there are two components here – generalizability and validity . Generalizability is about how well the sample represents the population. Validity is about how accurately you’ve measured what you intended to measure .

To ace this part of your dissertation defense, make sure that you’re very familiar with the concepts of generalizability , validity and reliability , and how these apply to your research. Remember, you don’t need to achieve perfection – you just need to be aware of the strengths and weaknesses of your research (and how the weaknesses could be improved upon).

Need a helping hand?

#6: What were the main shortcomings and limitations created by your research design?

This question picks up where the last one left off.

As I mentioned, it’s perfectly natural that your research will have shortcomings and limitations as a result of your chosen design and methodology. No piece of research is flawless. Therefore, a good dissertation defense is not about arguing that your work is perfect, but rather it’s about clearly articulating the strengths and weaknesses of your approach.

To address this question well, you need to think critically about all of the potential weaknesses your design may have, as well as potential responses to these (which could be adopted in future research) to ensure you’re well prepared for this question. For a list of common methodological limitations, check out our video about research limitations here .

#7: How did your findings relate to the existing literature?

This common dissertation defense question links directly to your discussion chapter , where you would have presented and discussed the findings in relation to your literature review.

What your dissertation or thesis committee is assessing here is your ability to compare your study’s findings to the findings of existing research . Specifically, you need to discuss which findings aligned with existing research and which findings did not. For those findings that contrasted against existing research, you should also explain what you believe to be the reasons for this.

As with many questions in a viva voce, it’s both the what and the why that matter here. So, you need to think deeply about what the underlying reasons may be for both the similarities and differences between your findings and those of similar studies.

#8: What were your key findings in relation to the research questions?

This question is similar to the last one in that it too focuses on your research findings. However, here the focus is specifically on the findings that directly relate to your research questions (as opposed to findings in general).

So, a good way to prepare for this question is to step back and revisit your research questions . Ask yourself the following:

• What exactly were you asking in those questions, and what did your research uncover concerning them?
• Which questions were well answered by your study and which ones were lacking?
• Why were they lacking and what more could be done to address this in future research?

Conquering this part dissertation defense requires that you focus squarely on the research questions. Your study will have provided many findings (hopefully!), and not all of these will link directly to the research questions. Therefore, you need to clear your mind of all of the fascinating side paths your study may have lead you down and regain a clear focus on the research questions .

#9: Were there any findings that surprised you?

This question is two-pronged.

First, you should discuss the surprising findings that were directly related to the original research questions . Going into your research, you likely had some expectations in terms of what you would find, so this is your opportunity to discuss the outcomes that emerged as contrary to what you initially expected. You’ll also want to think about what the reasons for these contrasts may be.

Second, you should discuss the findings that weren’t directly related to the research questions, but that emerged from the data set . You may have a few or you may have none – although generally there are a handful of interesting musings that you can glean from the data set. Again, make sure you can articulate why you find these interesting and what it means for future research in the area.

What the committee is looking for in this type of question is your ability to interpret the findings holistically and comprehensively , and to respond to unexpected data. So, take the time to zoom out and reflect on your findings thoroughly.

#10: What biases may exist in your research?

Biases… we all have them.

For this question, you’ll need to think about potential biases in your research , in the data itself but also in your interpretation of the data. With this question, your committee is assessing whether you have considered your own potential biases and the biases inherent in your analysis approach (i.e. your methodology). So, think carefully about these research biases and be ready to explain how these may exist in your study.

In an oral defense, this question is often followed up with a question on how the biases were mitigated or could be mitigated in future research. So, give some thought not just to what biases may exist, but also the mitigation measures (in your own study and for future research).

#11: How can your findings be put into practice?

Another classic question in the typical viva voce.

With this question, your committee is assessing your ability to bring your findings back down to earth and demonstrate their practical value and application. Importantly, this question is not about the contribution to academia or the overall field of research (we’ll get to that next) – it is specifically asking about how this newly created knowledge can be used in the real world.

Naturally, the actionability of your findings will vary depending on the nature of your research topic. Some studies will produce many action points and some won’t. If you’re researching marketing strategies within an industry, for example, you should be able to make some very specific recommendations for marketing practitioners in that industry.

To help you flesh out points for this question, look back at your original justification for the research (i.e. in your introduction and literature review chapters). What were the driving forces that led you to research your specific topic? That justification should help you identify ways in which your findings can be put into practice.

#12: How has your research contributed to current thinking in the field?

While the previous question was aimed at practical contribution, this question is aimed at theoretical contribution . In other words, what is the significance of your study within the current body of research? How does it fit into the existing research and what does it add to it?

This question is often asked by a field specialist and is used to assess whether you’re able to place your findings into the research field to critically convey what your research contributed. This argument needs to be well justified – in other words, you can’t just discuss what your research contributed, you need to also back each proposition up with a strong why .

To answer this question well, you need to humbly consider the quality and impact of your work and to be realistic in your response. You don’t want to come across as arrogant (“my work is groundbreaking”), nor do you want to undersell the impact of your work. So, it’s important to strike the right balance between realistic and pessimistic .

This question also opens the door to questions about potential future research . So, think about what future research opportunities your study has created and which of these you feel are of the highest priority.

#13: If you could redo your research, how would you alter your approach?

This question is often used to wrap up a viva voce as it brings the discussion full circle.

Here, your committee is again assessing your ability to clearly identify and articulate the limitations and shortcomings of your research, both in terms of research design and topic focus . Perhaps, in hindsight, it would have been better to use a different analysis method or data set. Perhaps the research questions should have leaned in a slightly different direction. And so on.

This question intends to assess whether you’re able to look at your work critically , assess where the weaknesses are and make recommendations for the future . This question often sets apart those who did the research purely because it was required, from those that genuinely engaged with their research. So, don’t hold back here – reflect on your entire research journey ask yourself how you’d do things differently if you were starting with a  blank canvas today.

Recap: The 13 Key Dissertation Defense Questions

To recap, here are the 13 questions you need to be ready for to ace your dissertation or thesis oral defense:

As I mentioned, this list of dissertation defense questions is certainly not exhaustive – don’t assume that we’ve covered every possible question here. However, these questions are quite likely to come up in some shape or form in a typical dissertation or thesis defense, whether it’s for a Master’s degree, PhD or any other research degree. So, you should take the time to make sure you can answer them well.

If you need assistance preparing for your dissertation defense or viva voce, get in touch with us to discuss 1-on-1 coaching. We can critically review your research and identify potential issues and responses, as well as undertake a mock oral defense to prepare you for the pressures and stresses on the day.

Psst... there’s more!

This post was based on one of our popular Research Bootcamps . If you're working on a research project, you'll definitely want to check this out ...

14 Comments

Very interesting

Interesting. I appreciate!

Really appreciating

My field is International Trade

Interesting

This is a full course on defence. I was fabulously enlightened and I gained enough confidence for my upcoming Masters Defence.

There are many lessons to learn and the simplicity in presentationmakes thee reader say “YesI can”

This is so helping… it has Enlightened me on how to answer specific questions. I pray to make it through for my upcoming defense

Lovely to hear that 🙂

Really educative and beneficial

Interesting. On-point and elaborate. And comforting too! Thanks.

Thank you very much for the enlightening me, be blessed

Thankyou so much. I am planning to defend my thesis soon and I found this very useful

Very interesting and useful to all masters and PhD students

Wow! this is enlightening. Thanks for the great work.

Thank you very much ,it will help me My Master Degree. and am comfortable to my defense.

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• PhD Viva Voces – A Complete Guide
• Doing a PhD
• A PhD viva involves defending your thesis in an oral examination with at least two examiners.
• The aim of a PhD viva is to confirm that the work is your own , that you have a deep understanding of your project and, overall, that you are a competent researcher .
• There are no standard durations, but they usually range from one to three hours, with most lasting approximately two hours .
• There are six outcomes of a PhD viva: (1) pass without corrections (2) pass subject to minor corrections, (3) pass subject to major corrections, (4) downgrade to MPhil with no amendments, (5) downgrade to MPhil subject to amendments, (6) immediate fail.
• Almost all students who sit their viva pass it, with the most common outcome being ‘(2) – pass subject to minor corrections’.

What Is a PhD Viva?

A viva voce , more commonly referred to as ‘viva’, is an oral examination conducted at the end of your PhD and is essentially the final hurdle on the path to a doctorate. It is the period in which a student’s knowledge and work are evaluated by independent examiners.

In order to assess the student and their work around their research question, a viva sets out to determine:

• you understand the ideas and theories that you have put forward,
• you can answer questions about elements of your work that the examiners have questions about,
• you understand the broader research in your field and how your work contributes to this,
• you are aware of the limitations of your work and understand how it can be developed further,
• your work makes an original contribution, is your own and has not been plagiarised.

Note: A viva is a compulsory procedure for all PhD students, with the only exception being when a PhD is obtained through publication as opposed to the conventional route of study.

Who Will Attend a Viva?

In the UK, at least two examiners must take part in all vivas. Although you could have more than two examiners, most will not in an attempt to facilitate a smoother questioning process.

One of the two examiners will be internal, i.e. from your university, and the other will be external, i.e. from another university. Regardless, both will be knowledgeable in your research field and have read your thesis beforehand.

In addition to your two examiners, two other people may be present. The first is a chairperson. This is an individual who will be responsible for monitoring the interview and for ensuring proper conduct is followed at all times. The need for an external chairperson will vary between universities, as one of the examiners can also take on this role. The second is your supervisor, whose attendance is decided upon by you in agreement with your examiners. If your supervisor attends, they are prohibited from asking questions or from influencing the outcome of the viva.

To avoid any misunderstandings, we have summarised the above in a table:

Note: In some countries, such as in the United States, a viva is known as a ‘PhD defense’ and is performed publicly in front of a panel or board of examiners and an open audience. In these situations, the student presents their work in the form of a lecture and then faces questions from the examiners and audience which almost acts as a critical appraisal.

How Long Does a Viva Last?

Since all universities have different guidelines , and since all PhDs are unique, there are no standard durations. Typically, however, the duration ranges from one to three hours, with most lasting approximately two hours.

Your examiners will also influence the duration of your viva as some will favour a lengthy discussion, while others may not. Usually, your university will consult your examiners in advance and notify you of the likely duration closer to the day of your viva.

What Happens During a Viva?

Regardless of the subject area, all PhD vivas follow the same examination process format as below.

Introductions

You will introduce yourselves to each other, with the internal examiner normally introducing the external examiner. If an external chairperson is present, they too are introduced; otherwise, this role will be assumed by one of the examiners.

Procedure Explained

After the introductions, the appointed chair will explain the viva process. Although it should already be known to everyone, it will be repeated to ensure the viva remains on track during the forthcoming discussion.

Warm-Up Questions

The examiners will then begin the questioning process. This usually starts with a few simple opening questions, such as asking you to summarise your PhD thesis and what motivated you to carry out the research project.

In-Depth Questions

The viva questions will then naturally increase in difficulty as the examiners go further into the details of your thesis. These may include questions such as “What was the most critical decision you made when determining your research methodology ?”, “Do your findings agree with the current published work?” and “How do your findings impact existing theories or literature? ”. In addition to asking open-ended questions, they will also ask specific questions about the methodology, results and analysis on which your thesis is based.

Closing the Viva

Once the examiners are satisfied that they have thoroughly evaluated your knowledge and thesis, they will invite you to ask any questions you may have, and then bring the oral examination to a close.

What Happens After the Viva?

Once your viva has officially ended, your examiners will ask you to leave the room so that they can discuss your performance. Once a mutual agreement has been reached, which can take anywhere from 10 minutes to an hour, you will be invited back inside and informed of your outcome.

PhD Viva Outcomes

There are six possible outcomes to a viva:

• Immediate award of degree: A rare recommendation – congratulations, you are one of the few people who completely satisfied your examiners the first time around. You do not have to do anything further at this point.
• Minor amendments required: The most common recommendation – you obtain a pass on the condition that you make a number of minor amendments to your thesis, such as clarifying certain points and correcting grammatical errors. The time you have to make these changes depends on the number of them, but is usually one to six months.
• Major amendments required: A somewhat uncommon recommendation – you are requested to make major amendments to your thesis, ranging from further research to collecting more data or rewriting entire sections. Again, the time you have to complete this will depend on the number of changes required, but will usually be six months to one year. You will be awarded your degree once your amended thesis has been reviewed and accepted.
• Immediate award of MPhil: An uncommon recommendation – your examiners believe your thesis does not meet the standard for a doctoral degree but meets the standard for an MPhil (Master of Philosophy), a lower Master’s degree.
• Amendments required for MPhil: A rare recommendation – your examiners believe your thesis does not meet the standard for a doctoral degree, but with several amendments will meet the standard for an MPhil.
• Immediate fail: A very rare recommendation – you are given an immediate fail without the ability to resubmit and without entitlement to an MPhil.

Finding a PhD has never been this easy – search for a PhD by keyword, location or academic area of interest.

What Is the Pass Rate for Vivas?

Based on an  analysis of 26,076 PhD students  who took their viva exam between 2006 and 2017, the PhD viva pass rate in the UK is 96%; of those who passed, about 80% were required to make minor amendments to their thesis. The reason for this high pass rate is that supervisors will only put their students forward for a viva once they confidently believe they are ready for it. As a result, most candidates who sit a viva are already well-versed in their PhD topic before they even start preparing for the exam.

How Do I Arrange a Viva?

Your viva will be arranged either by the examiners or by the chairperson. The viva will be arranged at least one to two months after you have submitted your thesis and will arrange a viva date and venue that is suitable for all participants.

Can I Choose My Examiners?

At most universities, you and your supervisor will choose the internal and external examiners yourselves. This is because the examiners must have extensive knowledge of the thesis topic in order to be able to examine you and, as the author of the thesis in question, who else could better determine who they might be than you and your supervisor. The internal examiner is usually quite easy to find given they will be from your institution, but the external examiner may end up being your second or third preference depending on availability.

Can I Take Notes Into a Viva?

A viva is about testing your competence, not your memory. As such, you are allowed to take notes and other supporting material in with you. However, keep in mind that your examiners will not be overly impressed if you constantly have to refer to your notes to answer each question. Because of this, many students prefer to take an annotated copy of their thesis, with important points already highlighted and key chapters marked with post-it notes.

In addition to an annotated copy of a thesis, some students also take:

• a list of questions they would like to ask the examiners,
• notes that were created during their preparation,
• a list of minor corrections they have already identified from their viva prep work.

How Do I Prepare for a PhD Viva?

There are several ways to prepare for a PhD viva, one of the most effective being a mock viva voce examination . This allows you to familiarise yourself with the type of viva questions you will be asked and identify any weak areas you need to improve. They also give you the opportunity to practise without the pressure, giving you more time to think about your answers which will help to make sure that you know your thesis inside out. However, a mock viva exam is just one of many methods available to you – some of the other viva preparation methods can be found on our “ How to Prepare for a PhD Viva ” page.

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5 tips for passing your PhD viva

Every Doctoral researcher is expected to defend their thesis through an oral test known as a viva voce - so discover how to prepare for your PhD viva and ensure you make a good impression on the examiners

1. Understand what's expected of you

The PhD viva exam has traditionally always taken place in person, with the interview style discussion overseen by at least two (internal and external) examiners. Afterwards, you would be provided with a joint written report detailing any corrections that need to be made.

However, during the pandemic, the online PhD viva become more commonplace with this exam more likely to take place via Microsoft Teams, Skype or Zoom. Even now, a number of years later, many universities still allow for the viva to take place online, or a hybrid of online and in-person assessment.

The virtual experience still follows much the same format, but you'll be briefed in advance about the arrangements and any technical aspects to bear in mind. You can prepare for an online PhD viva by reading our video interview tips .

The chair of the viva is usually the internal examiner, although it can be an independent person. If you and the examiners agree, your PhD supervisor can also be present.

The examiners' main objective is to ascertain that you've written your own thesis, so if you have and are ready to talk through how you completed it, there's no need to panic. You may even enjoy the viva voce test.

In addition to assessing your thesis, the examiners are also there to assist you in deciding how and where this research might be published.

There are various results between a 'pass' and 'fail' but it's very rare to slip up at this point of a PhD. Most Doctorate awards will be made upon the condition that a number of minor corrections are made, with re-submission requests far less common.

While the pass rate is high, the viva exam itself can still be intellectually demanding. This is because you'll be debating issues that are conceptually complex, so preparation is crucial to your success.

At the end of it, whatever the outcome, be prepared to take on board any advice, as the examiners are there to help you improve your argument or the presentation of your thesis.

2. Know your thesis inside out

While this isn't a memory test - as you're fine bringing notes and a copy of your thesis with you - it's still important to gain a good understanding of what you've written and be knowledgeable about your field of study.

You'll need to think carefully about where this original piece of work would be placed in the context of the wider body of research carried out in this field. Questions will be asked about this, as well as whether the project could possibly be developed further through any future research.

As you'll be explaining parts of the document to the examiners (who'll also have a digital or physical copy), make sure the pagination is the same in your version as the one they're looking at to avoid any issues regarding everybody being on the same page.

If you get stuck at any point during the viva exam, you can use looking at the thesis as an excuse to re-focus and gather your thoughts.

3. Anticipate the PhD viva questions

The examiners will have prepared a series of questions for you to answer at the viva voce, but this is nothing to get too concerned about. The questions will all be based on your thesis - what it's about, what you did and what you found out - and why this matters, in relation to your field of study.

So when getting ready for the viva, consider the types of questions you're likely to be asked, including:

• What original contribution has your thesis made to this field of study?
• Explain the main research questions you were hoping to address.
• What are the strengths and weaknesses of your thesis?
• If you had to start the thesis again, what would you do differently?
• If funding was no object, describe how you'd follow on from this project.
• What are your plans for the future?

It can be helpful to practise your answers beforehand, ideally vocalising them by arranging a mock mini viva - although, as you aren't restricted in terms of referring to notes in the exam, you can leave room for spontaneity, and you don't need to learn it all off by heart.

If your viva is being held online, you can ensure any technical issues are identified before the day by having a run through with your supervisor or a friend.

While it may sound simple, stick to answering the questions posed. It's really easy to go off on a tangent and this can open up other lines of enquiry from the examiners - possibly in areas you hadn't expected to be quizzed about.

On the other hand, it's completely fine to bring personality to your reasoning and use stories as a means of describing the learning process you've gone through and the techniques mastered over the last three or four years that have brought you to this point.

4. Learn about your examiners' own work

The senior and well-respected academics who'll be reading your thesis will have their own ideas on conducting PhD standard research. Therefore, it's worth taking a look online at their academic and LinkedIn profiles to discover if there's any correlation with the research they've had published and your own work.

From this, you should be able to gain a better idea of their motivations, their possible views on your thesis and the kinds of questions they might wish to discuss after having read through it.

You should research up-to-date theories, read any recent papers on the subject and speak to others who've recently had their own viva exam. Think about how your work differentiates from the research carried out by others in your chosen field.

Prepare to provide any supporting evidence asked of you by the examiners - for example, they may request to see experimental data you mention once the exam is over.

It's also necessary to check the policies and practices in place at your university and be sure of what the roles of the examiners are and how the viva panel will be structured. In many cases, Doctoral students can choose the examiners conducting the PhD viva.

5. Plan towards the viva exam

From the moment you know the date of your viva voce, work backwards and plan the steps you'll need to take before the day itself. Allow enough time to assess and review your work so that as the day approaches, you can focus on the practicalities.

This encompasses everything from making sure you relax, eat and sleep well the day before to arranging transport so you get to the viva on time.

An online PhD viva will present its own challenges, so ensure your working space is presentable and you still make an effort in terms of what you'll be wearing.

It's always advisable to adhere to interview etiquette and go with something that's both smart and comfortable. By looking the part, this should get you in the right frame of mind to communicate in a professional manner.

In the build-up, avoid any situations that might make you feel stressed and instead try to adopt a positive attitude, one that results in a genuine eagerness to engage in a debate about the work you've been toiling over.

If you're travelling to the exam, be sure to check that you have everything you need, including the thesis, plus any notes or other materials that will help support your claims.

The Doctoral viva can last between one and four hours - usually two - so it's necessary to pace yourself to get off to the best possible start.

Remember, the examiners aren't trying to trip you up - they want you to pass and are primarily there to hear you talk about your project. So, after the polite introductions, they'll typically start with an icebreaker to put you at ease and help calm the nerves.

It's meant to be an open and honest conversation about your work, so feel free to politely disagree with the examiners, especially on areas you feel strongly about. Don't forget to use examples from your thesis to back up what you're saying, remembering to be clear and concise.

If you know your way around your thesis and can explain your thinking and way of working, this test shouldn't be a problem. And if you don't know the answer to a specific question - admit it, as it's better to concede your limitations in an area than ramble on and hope they don't notice you're struggling to come up with an explanation.

Remember that no research is perfect, so it's important to appreciate this during the discussion - but don't be too overcritical about your work either, as that's not your job.

Finally, as the PhD viva can quickly move from a series of friendly questions to those that are more in-depth, take some time to think before answering. Don't worry about any periods of silence from the examiners, as this certainly isn't an indication that you're doing badly.

Find out more

• Read about 5 challenges faced by PhD students .
• Explore possible careers at your PhD, what next?
• Consider getting an academic job .

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Defending your doctoral thesis: the PhD viva

From Vitae.ac.uk

Once you have submitted your thesis you will be invited to defend your doctorate at a ‘ viva voce ‘ (Latin for ‘by live voice’) or oral examination. The thesis defence can be a daunting prospect, but many people really enjoy this experience of discussing their PhD research with genuinely interested experts. It can also be a useful networking opportunity.

Format for defending a doctoral thesis.

Every institution will have specific regulations for the thesis defence. In some countries or institutions, the convention is for thesis defences to be public events where you will give a lecture explaining your research, followed by a discussion with a panel of examiners (opponents). Both your examiners and the audience are able to ask questions.

In other countries, including the UK, the oral examination is usually conducted behind closed doors by at least two examiners, usually with at least one being from another institution (external examiner) and an expert in your topic of research. In the UK the supervisor does not participate in the viva, but may be allowed to observe. Sometimes someone from your own institution is appointed as an independent chair. Although it is now becoming more common for the candidate to have an opportunity to give a public lecture in UK institutions, this does not form part of the examination and may or may not be attended by the examiners.

Viva preparation

Take the preparation for your viva seriously and devote a substantial amount of time to it. The  viva preparation checklist  may be useful to help you prepare.

Your institution may offer courses on viva preparation and there may be opportunities to organise a practice viva. Take advantage of these opportunities: they can be extremely valuable experiences.

Things you may wish to take with you

• your thesis – mildly annotated if you wish
• a list of questions that you might be asked and your planned responses
• any questions that you want to ask your examiners
• additional notes which you have made during your revision
• list of minor corrections that you have come across during your revision.

During the viva

Your study will have strengths and weaknesses: it is essential that you are prepared to discuss both. You could think of any weaknesses as an opportunity to demonstrate your skill at critical appraisal. Examiners will seek to find and discuss weaknesses in all theses. Do not interpret criticism as indication of a possible negative outcome.

Examiners have different personalities, styles and levels of experience. Sometimes a candidate may feel that a challenge is made in a confrontational way. Experienced, effective examiners will not be inappropriately confrontational, but some will. Do not take offence. A relaxed, thoughtful, and non-confrontational response from you will help re-balance the discussion. Having an independent chair can help maintain a constructive environment.

Useful tips for during your viva:

• Ask for clarification of ambiguous questions or ask for the question to be repeated if necessary
• Take time to think before answering
• Be prepared to ask questions and enter into a dialogue with your examiners
• Be prepared to discuss your research in context of other work done in your field
• Be ready to admit if you don’t know the answer to a question
• Be prepared to express opinions of your own

You are not expected to have perfect recall of your thesis and everything that you have read and done. If you get flustered, or need to refer to notes your examiners will understand. They have been in your situation themselves!

After your viva

There are several  possible outcomes   of a thesis defence. Most commonly, your examiners will recommend to your institution that you are awarded your degree subject to minor corrections, although in some instances they might ask for more substantial work.

Shared from Vitae.ac.uk – https://www.vitae.ac.uk/doing-research/doing-a-doctorate/completing-your-doctorate/your-viva

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https://www.vitae.ac.uk/doing-research/doing-a-doctorate/completing-your-doctorate/your-viva/viva-checklist

This page has been reproduced from the Vitae website (www.vitae.ac.uk). Vitae is dedicated to realising the potential of researchers through transforming their professional and career development.

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Thesis defence checklist

This list gives you suggestions helpful in preparing to defend your thesis:

• I know my thesis thoroughly
• I have written a one-page summary of each chapter
• I have continued to work with my thesis after submission or have begun to prepare a conference paper or publication
• I am able to explain how my thesis fits into the big picture
• I have kept up to date with relevant literature
• I know what the implications of my research are to both theory and practice
• I have had a mock viva with my main supervisor
• I have asked my peers to quiz and challenge me about my thesis
• I have explained my thesis to friends and family who are not familiar with it
• I have investigated the backgrounds and publications of my examiners
• I have looked at my institution's guidelines for vivas
• I have produced a list of likely questions
• I have identified areas of my thesis that are likely to be challenged
• I have marked up my thesis to help me refer to it in the viva
• I know how I will be informed of the outcome of my viva.

For more advice, have a look at How to survive your viva by Rowena Murray (ISBN 0-335-21284-0) or The Doctoral Examination Process: A handbook for students, examiners and supervisors by Penny Tinkler and Carolyn Jackson (ISBN 978-0-335-21305-4).

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