How to Write a Psychology Dissertation: Structure, APA Style and Ethics

A psychology dissertation is different from a dissertation in most other subjects. Rather than a long literature-based argument, it is usually a scientific report of a study you designed and ran yourself, written to strict APA conventions. Markers look closely at whether your hypotheses follow from the literature, whether your method could be replicated and whether your statistics are reported correctly. This guide walks through each section and the mistakes that cost marks most often.

1. Choose a researchable question

A good psychology dissertation question is narrow, testable and realistic with the participants you can actually recruit in a few weeks. Start from a recent finding in an area you enjoy, then ask what is still unknown: a new population, a new variable, or a replication with a twist. Check that validated measures exist for the constructs you want to study, because creating your own questionnaire adds a lot of extra work. Our guide to finding unique dissertation ideas can help you shortlist options.

2. Introduction: build the case for your hypotheses

The introduction moves from the broad topic to the specific gap, then states your aims and hypotheses. Every hypothesis should be directly supported by the studies you review. A common mistake is reviewing interesting research that never connects to the hypotheses at the end. For help structuring this section, see our guide to organising a literature review.

3. Method: make it replicable

Write the method so another researcher could repeat your study exactly. Use the APA sub-headings:

• Participants: number, recruitment, inclusion criteria and demographics (for example age range, mean and standard deviation).
• Design: experimental, correlational or qualitative; independent and dependent variables; between- or within-subjects.
• Materials: each measure, with its source, number of items, scoring and reliability (such as Cronbach’s alpha).
• Procedure: what participants did, in order, including consent and debrief.

If you are using a questionnaire, our guide to survey design and questionnaire development covers validity, reliability and Likert scales.

4. Ethics approval

UK psychology programmes follow the British Psychological Society’s Code of Human Research Ethics, and you must have approval from your department’s ethics committee before recruiting anyone. Expect to explain informed consent, the right to withdraw, how data will be anonymised and stored under UK GDPR, and how you will handle any risk of distress. Read our guide to ethical considerations in research before you apply.

5. Results: report statistics in APA format

Report descriptive statistics first, then each inferential test in the order of your hypotheses. Include the test statistic, degrees of freedom, exact p value and an effect size, for example: t(48) = 2.31, p = .025, d = 0.65. Do not interpret findings here; save that for the discussion. Most students analyse their data in SPSS, JASP or R. If your analysis is the part you are unsure about, our SPSS data analysis service and dissertation data analysis specialists can run and explain the tests with you.

6. Discussion: interpret, don’t repeat

Open with a one-paragraph summary of whether each hypothesis was supported, then explain your findings in relation to the studies from your introduction. Discuss limitations honestly but specifically (for example sample size or self-report bias), and finish with practical implications and concrete directions for future research.

Common mistakes that lose marks

• Hypotheses that are not justified by the literature reviewed.
• Missing effect sizes or incorrectly formatted statistics.
• Interpreting results in the results section.
• Generic limitations such as “the sample was small” with no explanation of the impact.
• Inconsistent APA referencing, especially for secondary citations.

Getting help with your psychology dissertation

If you are stuck on a particular stage, our psychology specialists can help with your literature review, method, statistical analysis or final editing. See our psychology essay and dissertation writing help, or get support with a single chapter through our research methodology help and literature review help services. Use any support as a model and check your university’s academic integrity policy.

Frequently asked questions

How long is a psychology dissertation?

Most UK undergraduate psychology dissertations are between 6,000 and 10,000 words, and Masters dissertations are often 10,000 to 15,000 words. The limit is set by your university, and the abstract, references and appendices are usually excluded.

What referencing style is used for a psychology dissertation?

UK psychology departments almost always use APA style, currently the 7th edition. It covers in-text citations, the reference list, headings, tables, figures and the format for reporting statistics.

Do I need ethics approval for a psychology dissertation?

Yes. Any study involving human participants needs approval from your department’s ethics committee before you recruit or collect data, following the British Psychological Society’s Code of Human Research Ethics.

Can I get help with the statistics in my psychology dissertation?

Yes. Our SPSS data analysis service can run your tests, explain the output and help you write up the results in APA format. Data analysis support starts at £10.50 per page (250 words) for undergraduate work with a 15+ day deadline.