How to write an APA methods section
The methods section of an APA style paper is where you report in detail how you performed your study. Research papers in the social and natural sciences often follow APA style. This article focuses on reporting quantitative research methods.
In your APA methods section, you should report enough information to understand and replicate your study, including detailed information on the sample, measures, and procedures used.
Structuring an APA methods section
The main heading of “Methods” should be centered, boldfaced, and capitalized. Subheadings within this section are left-aligned, boldfaced, and in title case. You can also add lower level headings within these subsections, as long as they follow APA heading styles.
To structure your methods section, you can use the subheadings of “Participants,” “Materials,” and “Procedures.” These headings are not mandatory—aim to organize your methods section using subheadings that make sense for your specific study.
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Note that not all of these topics will necessarily be relevant for your study. For example, if you didn’t need to consider outlier removal or ways of assigning participants to different conditions, you don’t have to report these steps.
The APA also provides specific reporting guidelines for different types of research design. These tell you exactly what you need to report for longitudinal designs, replication studies, experimental designs, and so on. If your study uses a combination design, consult APA guidelines for mixed methods studies.
Detailed descriptions of procedures that don’t fit into your main text can be placed in supplemental materials (for example, the exact instructions and tasks given to participants, the full analytical strategy including software code, or additional figures and tables).
Begin the methods section by reporting sample characteristics, sampling procedures, and the sample size.
Participant or subject characteristics
When discussing people who participate in research, descriptive terms like “participants,” “subjects” and “respondents” can be used. For non-human animal research, “subjects” is more appropriate.
Specify all relevant demographic characteristics of your participants. This may include their age, sex, ethnic or racial group, gender identity, education level, and socioeconomic status. Depending on your study topic, other characteristics like educational or immigration status or language preference may also be relevant.
Be sure to report these characteristics as precisely as possible. This helps the reader understand how far your results may be generalized to other people.
The APA guidelines emphasize writing about participants using bias-free language, so it’s necessary to use inclusive and appropriate terms.
Outline how the participants were selected and all inclusion and exclusion criteria applied. Appropriately identify the sampling procedure used. For example, you should only label a sample as random if you had access to every member of the relevant population.
Of all the people invited to participate in your study, note the percentage that actually did (if you have this data). Additionally, report whether participants were self-selected, either by themselves or by their institutions (e.g., schools may submit student data for research purposes).
Identify any compensation (e.g., course credits or money) that was provided to participants, and mention any institutional review board approvals and ethical standards followed.
Sample size and power
Detail the sample size (per condition) and statistical power that you hoped to achieve, as well as any analyses you performed to determine these numbers.
It’s important to show that your study had enough statistical power to find effects if there were any to be found.
Additionally, state whether your final sample differed from the intended sample. Your interpretations of the study outcomes should be based only on your final sample rather than your intended sample.
Write up the tools and techniques that you used to measure relevant variables. Be as thorough as possible for a complete picture of your techniques.
Primary and secondary measures
Define the primary and secondary outcome measures that will help you answer your primary and secondary research questions.
Specify all instruments used in gathering these measurements and the construct that they measure. These instruments may include hardware, software, or tests, scales, and inventories.
- To cite hardware, indicate the model number and manufacturer.
- To cite common software (e.g., Qualtrics), state the full name along with the version number or the website URL.
- To cite tests, scales or inventories, reference its manual or the article it was published in. It’s also helpful to state the number of items and provide one or two example items.
Make sure to report the settings of (e.g., screen resolution) any specialized apparatus used.
For each instrument used, report measures of the following:
- Reliability: how consistently the method measures something, in terms of internal consistency or test-retest reliability.
- Validity: how precisely the method measures something, in terms of construct or criterion validity.
Giving an example item or two for tests, questionnaires, and interviews is also helpful.
Describe any covariates—these are any additional variables that may explain or predict the outcomes.
Quality of measurements
Review all methods you used to assure the quality of your measurements.
These may include:
- training researchers to collect data reliably,
- using multiple people to assess (e.g., observe or code) the data,
- translation and back-translation of research materials,
- using pilot studies to test your materials on unrelated samples.
For data that’s subjectively coded (for example, classifying open-ended responses), report interrater reliability scores. This tells the reader how similarly each response was rated by multiple raters.
Report all of the procedures applied for administering the study, processing the data, and for planned data analyses.
Data collection methods and research design
Data collection methods refers to the general mode of the instruments: surveys, interviews, observations, focus groups, neuroimaging, cognitive tests, and so on. Summarize exactly how you collected the necessary data.
Describe all procedures you applied in administering surveys, tests, physical recordings, or imaging devices, with enough detail so that someone else can replicate your techniques. If your procedures are very complicated and require long descriptions (e.g., in neuroimaging studies), place these details in supplementary materials.
To report research design, note your overall framework for data collection and analysis. State whether you used an experimental, quasi-experimental, descriptive (observational), correlational, and/or longitudinal design. Also note whether a between-subjects or a within-subjects design was used.
For multi-group studies, report the following design and procedural details as well:
- how participants were assigned to different conditions (e.g., randomization),
- instructions given to the participants in each group,
- interventions for each group,
- the setting and length of each session(s).
Describe whether any masking was used to hide the condition assignment (e.g., placebo or medication condition) from participants or research administrators. Using masking in a multi-group study ensures internal validity by reducing bias. Explain how this masking was applied and whether its effectiveness was assessed.
Outline all steps taken to scrutinize or process the data after collection.
This includes the following:
- procedures for identifying and removing outliers,
- data transformations to normalize distributions,
- compensation strategies for overcoming missing values.
To ensure high validity, you should provide enough detail for your reader to understand how and why you processed or transformed your raw data in these specific ways.
The methods section is also where you describe your statistical analysis procedures, but not their outcomes. Their outcomes are reported in the results section.
These procedures should be stated for all primary, secondary, and exploratory hypotheses. While primary and secondary hypotheses are based on a theoretical framework or past studies, exploratory hypotheses are guided by the data you’ve just collected.
Example of an APA methods section
This annotated example reports methods for a descriptive correlational survey on the relationship between religiosity and trust in science in the US. Hover over each part for explanation of what is included.
Frequently asked questions about writing an APA methods section
- What should I include in an APA methods section?
In your APA methods section, you should report detailed information on the participants, materials, and procedures used.
- Describe all relevant participant or subject characteristics, the sampling procedures used and the sample size and power.
- Define all primary and secondary measures and discuss the quality of measurements.
- Specify the data collection methods, the research design and data analysis strategy, including any steps taken to transform the data and statistical analyses.
- What tense should I write the methods section in?
- Where does the methodology section go in a research paper?
In a scientific paper, the methodology always comes after the introduction and before the results, discussion and conclusion. The same basic structure also applies to a thesis, dissertation, or research proposal.