Most dissertation problems are avoidable. They usually come from a vague research question, a plan that is too ambitious or leaving key steps, such as ethics approval and proofreading, until the end. This guide covers 12 common dissertation mistakes UK students make and practical ways to avoid them.
Key takeaways
- Narrow your research question early and agree it with your supervisor.
- Match your methodology to your question, not the other way round.
- Build in time for ethics approval, data collection, writing and proofreading.
- Follow your university’s rules on referencing, AI tools and proofreading help.
1. Choosing a topic that is too broad
“Social media and mental health” is a subject, not a dissertation. Narrow it by population, setting, time period or method: for example, “How do UK sixth-form students describe the effect of TikTok use on their sleep?” A focused question is easier to research properly within the word count.
2. Writing a research question you cannot answer
Check that you can access the data, participants or sources you need within your timeframe. If your question depends on interviewing senior executives or accessing confidential records, have a realistic backup plan.
3. Not using your supervisor well
Your supervisor can save you weeks of wasted work, but only if you use them. Send short, specific updates before meetings, ask direct questions, and act on feedback or explain why you have chosen a different approach. Don’t assume silence means approval; confirm major decisions in writing.
4. Treating the literature review as a summary
A literature review should analyse and compare sources, show where they agree and disagree, and identify the gap your study addresses. Organise it by theme or debate rather than by author, and keep it focused on your research question.
5. Choosing a methodology that doesn’t fit the question
Questions about “how many” or “how much” usually suit quantitative methods. Questions about how and why people experience something often suit qualitative methods. Explain clearly why your approach fits, and acknowledge its limitations.
6. Designing your own survey without testing it
Where possible, use or adapt an established, validated questionnaire and cite it. If you must write your own, pilot it with a few people first to catch confusing or leading questions.
7. Leaving ethics approval too late
Most research involving people needs approval from your university’s ethics committee before data collection starts. Approval can take several weeks, so apply as early as your department allows.
8. Poor time management
Work backwards from the submission date. Allow time for ethics approval, data collection, analysis, writing, supervisor feedback and at least a week for editing and proofreading. Set weekly targets and keep a simple progress log.
9. Weak structure and signposting
Each chapter should have a clear purpose and link back to your research question. Use short introductions and summaries so examiners can follow your argument without searching for it.
10. Referencing errors and poor academic practice
Use the referencing style your department requires, consistently, from the first draft. Build your reference list as you read, using a tool such as Zotero or EndNote, so you never lose track of a source. Poor referencing can look like plagiarism even when it is accidental.
11. Misusing AI tools
Universities have different rules on generative AI. Some allow it for brainstorming or checking grammar; many forbid it for writing assessed work. Read your university’s policy, follow it exactly and declare any permitted use. The dissertation must be your own work.
12. Not leaving time to edit and proofread
Typos, inconsistent terms and formatting errors distract examiners and can cost marks. Read your work aloud, check tables and figures, and confirm what proofreading help your university permits. Many universities allow a proofreader to correct spelling, grammar and formatting but not to rewrite content or arguments.
Dissertation checklist
- Research question narrowed and agreed with your supervisor
- Methodology justified and limitations acknowledged
- Ethics approval obtained before data collection
- Literature review organised by themes and gaps
- Referencing consistent and complete
- Any AI use within your university’s policy and declared if required
- Time left for editing and permitted proofreading
Dissertation mistakes: FAQs
What is the most common dissertation mistake?
Choosing a topic or research question that is too broad. It leads to shallow analysis and makes it hard to finish within the word count and deadline.
How early should I start my dissertation?
As soon as your department allows. Starting early leaves time for ethics approval, supervisor feedback and unexpected delays in data collection.
Can I change my dissertation topic?
Often yes, especially early on, but discuss it with your supervisor first and check whether you need fresh ethics approval.
Is it allowed to get help with my dissertation?
Your supervisor and your university’s study-skills service are the first places to go. Many universities also permit limited proofreading and coaching that help you improve your own work, but not someone else writing or rewriting it. Always check your university’s policy.
Need support that stays within your university’s rules? Our dissertation coaching and editing helps you plan, structure and improve your own work, and our proofreading and editing services correct language and formatting. We do not write assessed work for students. For the next step in planning your research, read how to write a hypothesis.
