How to Write a Methodology Chapter

What is a methodology chapter?

The methodology chapter explains how your research was conducted and, critically, why those methods were chosen. It is not sufficient to simply describe what you did, you must justify each methodological decision by reference to established research principles and demonstrate awareness of the limitations of your chosen approach.

For most dissertations and theses, the methodology is the third major chapter, following the introduction and literature review. It typically constitutes 15–20% of the total word count. If you need support writing your dissertation, GradeQuill's dissertation editing service covers all chapters including methodology.

Research philosophy and approach

Many postgraduate methodology chapters begin by positioning the research within a philosophical framework. The two most commonly discussed paradigms are positivism, the belief that reality is objective and measurable, associated with quantitative research, and interpretivism, the belief that meaning is constructed and context-dependent, associated with qualitative research.

Not all undergraduate dissertations require this level of philosophical discussion, but at Masters and PhD level, articulating your epistemological and ontological positioning demonstrates the depth of methodological understanding expected at postgraduate level.

Research design

Your research design is the overall strategy connecting your research questions to the methods you use to answer them. Common designs include experimental, survey-based, case study, ethnographic, action research, and systematic review designs.

For each design, justify why it is appropriate for your research questions. A case study design, for example, is justified when you need in-depth understanding of a specific context rather than broad generalisable findings. A systematic review design is appropriate when your aim is to synthesise existing published evidence on a question.

Data collection methods

Data collection methods are the specific tools you used to gather information. For qualitative research, common methods include semi-structured interviews, focus groups, documentary analysis, and ethnographic observation. For quantitative research, common methods include surveys with Likert scales, experiments, and analysis of existing datasets.

For each method, explain what it involves, why it is appropriate for your research questions, and what its limitations are. Acknowledging limitations in your chosen methods is not a weakness, it demonstrates methodological sophistication and intellectual honesty.

Sampling strategy

Your sampling section should describe who or what you collected data from, how you selected those participants or sources, and how large your sample was. For qualitative research, purposive and snowball sampling are commonly used. For quantitative research, random, stratified, or convenience sampling may be more appropriate.

Justify your sample size with reference to methodological literature. In qualitative research, sample size is determined by the principle of data saturation, the point at which additional data yields no new themes. In quantitative research, a power calculation may be used to determine the minimum sample size needed to detect a meaningful effect.

Ethical considerations

All primary research involving human participants must address ethical considerations. These typically include: informed consent (participants must understand what they are agreeing to and be free to withdraw); confidentiality and anonymisation of participant data; data storage and security; and potential risks or harms to participants.

State whether your research received ethical approval from your institution's ethics committee, and reference the ethical framework used (for example, the British Psychological Society's Code of Ethics for psychology research, or the BERA guidelines for educational research).

Limitations

Every piece of research has limitations, and acknowledging them honestly is a sign of methodological awareness, not weakness. Common limitations include small sample sizes that limit generalisability, self-report bias in survey data, the influence of the researcher's own positionality in qualitative work, and constraints of time or access.

Discussing limitations should be accompanied by brief justification, explaining why the research was still valid despite these constraints. For further guidance on dissertation writing, read our article on how to write a dissertation, or explore GradeQuill's dissertation editing service for chapter-level support.