How to Prepare for A-Level Psychology Research Methods Questions: Cambridge 9990 Methods Checklist and What to Include in Paper 2 and Paper 4 Design Questions

Cambridge International AS & A Level Psychology (9990) dedicates an entire paper to research methods (Paper 2 for AS), and A Level Paper 4 also includes a 24-mark research design essay. A key feature of research methods questions is that they are highly structured: the syllabus clearly outlines the required depth of knowledge for each method and concept, as well as the specific elements to include in design questions. Based on the 9990 syllabus (2027 edition), this article explains what to expect in research methods questions and how to write design answers. For the overall structure, see How Cambridge A-Level Psychology is Assessed, and for essay questions, see How to Write A-Level Psychology Essays. Since the Pearson website does not have an IAL Psychology page, this article focuses solely on Cambridge 9990.

1. Where Research Methods Are Tested

The official definition of AO2 (Application) includes "using knowledge and understanding to plan a research study" and applying psychology to familiar or unfamiliar contexts. Therefore, the core of research methods questions is not memorizing definitions, but applying methods to the new contexts provided in the questions. Almost every section of the syllabus includes the same requirement: "apply relevant knowledge to a new research context."

2. Research Methods to Master for AS

• Experiments: Features of laboratory and field experiments, and evaluation in terms of reliability, validity, and ethics; three experimental designs (independent groups, matched pairs, repeated measures); counterbalancing, random allocation, order effects (fatigue and practice); experimental and control groups;
• Self-report: Questionnaires (paper-based or online, open and closed questions); interviews (structured, unstructured, semi-structured; telephone or face-to-face);
• Case studies: In-depth study of a single participant or unit;
• Observations: Overt/covert, participant/non-participant, structured/unstructured, naturalistic/controlled;
• Correlational studies: Positive, negative, and strength of correlation; operationalizing co-variables; cannot establish causation;
• Longitudinal studies: Including experiments using a longitudinal design.

3. Methodological Concepts to Master for AS

• Aims and hypotheses: Writing research aims; identifying null and alternative hypotheses, including directional (one-tailed) and non-directional (two-tailed) hypotheses;
• Variables: Independent and dependent variables; how to measure the dependent variable; operationalization, and the ability to operationalize independent and dependent variables;
• Variable control: How to control variables, standardization of procedures; extraneous variables, participant variables, and situational variables;
• Types of data: Quantitative and qualitative data, subjective and objective data;
• Sampling: Samples and populations; opportunity sampling, random sampling, self-selected (volunteer) sampling, and evaluating their generalizability;
• Ethics: Human participants (minimizing harm, informed consent, right to withdraw, no deception, confidentiality, privacy, debriefing); animals (minimizing harm, replacement, species, numbers, pain in procedures, and housing conditions, etc.);
• Validity: Including ecological validity; subjectivity and objectivity, demand characteristics, generalizability;
• Reliability and replicability: Inter-rater and inter-observer reliability, test-retest reliability;
• Data analysis: Tables; measures of central tendency (mode, as well as median and mean); measures of dispersion (range, identifying and understanding standard deviation); identification, drawing, modification, and interpretation of bar charts, histograms, and scattergrams.

Note two points from the syllabus: At the AS level, students are not required to perform calculations (the median and mean are noted as "no calculation required"); nor are they required to understand or interpret statistical tests outside the syllabus. Therefore, the focus of revision should be on concepts and application, not arithmetic.

4. New Methods and Concepts for A Level

• Key features and evaluation of randomized controlled trials;
• Postal questionnaires; rating scales, forced/fixed-choice formats;
• Description and evaluation of psychometric tests;
• Ability to write null and directional/non-directional alternative hypotheses;
• Evaluating research based on validity, including temporal validity.

5. Research Design Questions: Different Requirements for the Two Papers

The syllabus lists the specific content required for the design questions in Paper 2 and Paper 4 separately, and the differences are crucial:

In addition, both papers require you to write out the specific elements of the research method used, which are listed individually in the syllabus:

• Experiments: Independent variable, dependent variable, control/standardization, experimental design (Paper 4 also requires the type of experiment, plus counterbalancing and random allocation where applicable); field experiments also require the location;
• Self-report: Question format (open/closed), example questions, scoring or interpretation method; for questionnaires, state the administration method; for interviews, state the type and method;
• Case studies: Details of the participant or unit, information collected, two or more data collection methods, analysis/interpretation/triangulation;
• Observations: Overt or covert, participant or non-participant, naturalistic or controlled, structured (behavioral categories) or unstructured (Paper 4 also requires the number of observers);
• Correlational studies: Two co-variables, how each is measured, the nature of the relationship or a scattergram;
• Longitudinal studies: Tests or tasks, scoring, frequency or intervals, how to re-contact participants for retesting, control/standardization.

6. How to Write a Design Question (Example)

The following framework is an example we created to demonstrate the structure; it is not an actual exam question: Design an experiment to investigate whether background music affects students' memory performance.

1. (Paper 4) Aims and hypotheses: The aim is to investigate the effect of background music on memory; the alternative hypothesis (non-directional): the number of words recalled will differ between the group with background music and the group without; the null hypothesis: there will be no difference between the two groups;
2. Experiment type and design: Laboratory experiment; independent groups design, with participants randomly allocated;
3. Independent variable (operationalized): Playing or not playing the same piece of music during learning, at a fixed volume;
4. Dependent variable (operationalized): The number of correct words written out within 3 minutes, 2 minutes after learning 20 words;
5. Controls: The same word list, the same time and room, standardized instructions;
6. (Paper 4) Sample, sampling, and ethics: For example, random sampling from high school students at a specific school; informed consent, right to withdraw, confidentiality, debriefing;
7. Data: Quantitative data; compare the means of the two groups and present using a bar chart;
8. Validity and reliability: Standardized procedures and identical materials improve reliability; controlling extraneous variables improves validity.

Key writing tips (based on experience): Every element must be specific and actionable. For example, instead of "measuring memory," write "the number of correct words written out within 3 minutes." For Paper 2, you do not need to write hypotheses or sampling details; save your time for the elements required by the syllabus.

7. Common Reasons for Losing Marks

Here is a summary based on experience:

• Variables not operationalized: Just writing "measuring anxiety" without explaining how it will be measured;
• Missing design elements: For example, not providing example questions for self-report, or only listing one data collection method for a case study;
• Writing unrequired content in Paper 2 while missing required elements;
• Failing to apply to the context: Copying definitions for context questions instead of applying them to the specific research given in the question;
• Claiming causation in correlational studies;
• Writing hypotheses as questions or confusing directional and non-directional hypotheses.

8. How to Practice

1. Print out the design elements checklist from the syllabus and check off each item every time you practice a design question;
2. Practice operationalization: Give yourself some abstract variables (stress, memory, aggression, satisfaction) and write measurable definitions for each;
3. Practice using core studies: Section A of Paper 2 tests research methods related to core studies. Organize the methods, design, sampling, ethics, validity, and reliability for all 12 core studies;
4. Practice evaluation: After designing a study, evaluate your design point by point in terms of practical issues, validity, and reliability (add sampling and ethics for Paper 4);
5. Refer to the mark scheme: Mark schemes for past papers are usually available through your school. Check how marks are awarded for each element in the design questions.

Conclusion

The key to scoring well in psychology research methods questions is to address every element listed in the syllabus thoroughly and specifically, and apply them to the context of the question. The design questions in Paper 2 and Paper 4 have different requirements: AS does not require calculations, hypotheses, or sampling details, while A Level requires all of them, with enough detail for replication. Treating the syllabus as a checklist for practice will help you master this section. If you need tutoring for A-Level Psychology, feel free to chat with our teachers.

Verification note: This article was verified in September 2026: The duration, marks, and structure of Paper 2 and Paper 4, the definition of AO2 and the weighting for each paper, the research methods and methodological concepts for AS, data analysis requirements and the notes that "no calculation is required" and "no understanding of statistical tests outside the syllabus is required," the new methods and concepts for A Level, and the checklist of elements for the research design questions in both papers are all from Cambridge International's "Psychology 9990 syllabus for 2027." The IAL Psychology page on the Pearson website showed "Page not found" at the time of our verification (see Article 172 on this site). The design question example was created by us. The writing tips, common reasons for losing marks, and practice methods are our experience-based suggestions.

References:

• Cambridge International: AS & A Level Psychology (9990)