A-Level Psychology: Research Methods — Design

Research methods carries a large share of A-Level Psychology marks (at least 25–30% of the assessment in the AQA specification, with a 48-mark section on AQA Paper 2) and is threaded through every other topic's evaluation marks. This quiz covers the design half: how studies are built, and what goes wrong when they are built badly.

The experimental-methods questions distinguish laboratory, field, natural and quasi-experiments, with the quasi-experiment's defining features — a pre-existing independent variable and no random allocation — tested as a set. Design questions cover independent groups, repeated measures and matched pairs through their genuine trade-offs: repeated measures controlling participant variables, random allocation neutralising individual differences in independent groups, and counterbalancing as the specific fix for order effects.

The rigour questions cover the psychology-specific threats: demand characteristics, investigator effects and the double-blind procedure as the standard countermeasure, plus operationalisation tested for its real purpose — measurable definitions that make replication possible.

Sampling gets scenario treatment: stratified sampling's proportional-representation logic tested against random, systematic, opportunity and volunteer alternatives. The ethics questions apply the BPS framework to the hardest case, deception, with debriefing and the right to withdraw data as the accepted management strategies. Observational and self-report techniques close the set, including the structured-versus-unstructured observation distinction.

Several questions are scenario-based (a researcher making a choice), because that is how the exam often presents this content; the rest test the definitions behind those choices. The companion quiz covers analysis: reliability, validity, statistics and inferential testing.

  • Distinguish laboratory, field, natural and quasi-experiments
  • Choose between experimental designs and justify counterbalancing and random allocation
  • Counter demand characteristics and investigator effects with blinding
  • Select and evaluate sampling methods for a given scenario
  • Apply BPS ethics to deception via debriefing and withdrawal rights

Covers the compulsory Research Methods content of A-level Psychology: experimental methods and designs, variables and operationalisation, demand characteristics, sampling, ethics under the BPS code, and observational and self-report techniques.

Sample question

In a study examining the impact of sleep duration on cognitive recall, a researcher decides to use a repeated measures design. Which of the following is a primary methodological advantage of this design over an independent groups design?

See the answer

It controls for participant variables by ensuring the same individuals are compared across conditions.

Repeated measures designs use the same participants in all conditions, which inherently controls for individual differences (participant variables) that could otherwise act as confounding variables. Counterbalancing is still needed, because order effects are a specific disadvantage of this design. Nor does it stop participants guessing the aim: taking part in every condition often makes the aim easier to guess.

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