Planning a study (Paper 4)

Psychology (9990) · Cambridge International A Level · 5 min read · Updated: 7 Sept 2026

Introduction to Planning a Study for Paper 4

Welcome to one of the most important parts of your A Level Psychology journey! In Paper 4 (Specialist Options), you are asked to step into the shoes of a researcher. Section B of this paper requires you to design an original psychological study based on a specific scenario and then evaluate it. This is your chance to show that you understand how research actually happens in the real world of Clinical, Consumer, Health, or Organisational Psychology.

Don't worry if this seems a bit overwhelming at first. Think of it like writing a recipe: if you provide the right ingredients (variables) and clear instructions (procedure), anyone should be able to "cook" your study exactly the same way!

The Planning Requirements (The 10-Mark Question)

In Paper 4, your plan needs to be much more detailed than it was for Paper 2. To get full marks, you must include specific elements so that your study is replicable (meaning someone else could follow your plan to repeat the study). Your plan must cover:

1. Aims and Hypotheses

You must clearly state what you are trying to find out (the aim) and what you predict will happen (the hypothesis). Remember these key types of hypotheses:

Alternative Hypothesis: Predicts a relationship or difference.
- Directional (one-tailed): Predicts exactly which way the results will go (e.g., "Group A will score higher than Group B").
- Non-directional (two-tailed): Predicts a difference but doesn't say which way (e.g., "There will be a difference between Group A and Group B").
Null Hypothesis \( (H_0) \): Predicts that any results are just due to chance (e.g., "There will be no significant difference...").

Top Tip: Always operationalise your variables! Instead of saying "happiness," say "a score from 1 to 10 on a subjective well-being scale."

2. Sample and Sampling Technique

You need to explain who your participants are and how you will find them. You should mention:

The Sample: Demographics like age range, gender, or specific characteristics (e.g., "employees at a retail store" or "patients diagnosed with OCD").
Sampling Technique: How will you get them? Will you use Opportunity sampling (whoever is available), Random sampling (everyone has an equal chance), or Volunteer/Self-selecting sampling (asking people to sign up)?

3. Method and Procedure

This is the "meat" of your plan. You must describe the step-by-step process. Depending on the method chosen (Experiment, Observation, Self-report, etc.), you must include:

Apparatus/Materials: What tools are you using? (e.g., a specific psychometric test, a rating scale, or fMRI scans).
Location: Where is it happening? (A laboratory, a field setting like a hospital, or an online postal questionnaire).
Controls: How will you keep the study fair? (Standardised instructions, random allocation to groups).

4. Ethics

Psychology is about people, so you must protect them! Your plan must mention how you will follow ethical guidelines:

Valid Consent: Ensuring participants know what they are joining.
Right to Withdraw: They can leave at any time.
Confidentiality: Keeping their data private.
Debriefing: Explaining the true aim after the study is over.
Minimising Harm: Ensuring no physical or psychological distress.

5. Data Analysis

How will you make sense of the numbers? For Paper 4, you only need to use descriptive statistics. You should state which ones you would use:

Measures of Central Tendency: Finding the mean, median, or mode.
Measures of Spread: Using the range or standard deviation \( (SD) \).
Visual Displays: How will you graph it? (e.g., a bar chart for different categories or a scatter graph for correlations).

Evaluating Your Plan (The 14-Mark Question)

After you have written your plan, you must critique it. This involves discussing the strengths and weaknesses of your design. Focus on these three areas:

1. Validity

Does your study actually measure what it claims to measure?

Ecological Validity: Is the environment and task realistic to everyday life?
Temporal Validity: Would these findings still be true in several years' time?
Demand Characteristics: Could participants guess the aim and change their behaviour?

2. Reliability

Is your study consistent?

Replicability: Are your instructions clear enough for someone else to do the exact same thing?
Inter-rater Reliability: If you are observing behaviour, would two different researchers see the same thing?
Test-retest Reliability: If you gave the same test to the same person later, would they get the same score?

3. Practical Issues

Think about the "real world" problems of your study. Is it too expensive? Does it take too long? Is it difficult to find the right participants? For example, a longitudinal study (tracking people over many years) provides great data but suffers from attrition (people dropping out).

A Level Specific Methods to Consider

When planning for Paper 4, the syllabus introduces extra methods you can use beyond the basic AS Level ones:

Randomised Control Trials (RCTs): Often used in Clinical Psychology to test if a treatment works by randomly assigning patients to a treatment group or a control group.
Psychometric Tests: Standardised tests that measure mental traits (e.g., the Beck Depression Inventory).
Rating Scales: Using forced/fixed choice questions or Likert scales (e.g., 1-5) to get quantitative data from a self-report.

Quick Review: The Paper 4 Planning Checklist

When you are practicing, ask yourself: "Could a stranger read this and perform my study exactly as I imagined?"

Checklist:

Did I write a Null and Alternative hypothesis?
Is my Independent Variable (IV) and Dependent Variable (DV) operationalised?
Did I name a sampling technique?
Did I mention descriptive statistics (e.g., \( mean \)) for analysis?
Did I include at least two ethical protections?
In my evaluation, did I mention validity and reliability?

Summary Key Takeaway

In Paper 4, planning is about detail and justification. You aren't just saying what you will do; you are showing how it works scientifically and why you chose those methods. By including aims, hypotheses, detailed procedures, ethics, and data analysis, you ensure your study is robust and replicable!

Quick check

Can you answer these now?

Open each question to check the key ideas from this chapter.

What is the primary goal of the planning task in Paper 4 (Section B)?

The goal is to design an original, replicable psychological study based on a specific scenario in one of the specialist options.

What is the difference between a directional and a non-directional hypothesis?

A directional (one-tailed) hypothesis predicts the specific direction of results, while a non-directional (two-tailed) hypothesis predicts a difference without specifying which way it will go.

What does it mean to "operationalise" a variable?

Operationalising means defining a variable in a clear, measurable way (e.g., measuring "happiness" as a score on a scale of 1-10).

What are the three sampling techniques mentioned for selecting participants?

The techniques are Opportunity sampling (using whoever is available), Random sampling (everyone has an equal chance of selection), and Volunteer/Self-selecting sampling (participants sign up).

What key components must be included in the Method and Procedure section?

You must include the apparatus/materials used, the specific location (setting), and the controls used to keep the study fair.

Which ethical guidelines should be addressed in a research plan?

The plan should cover valid consent, the right to withdraw, confidentiality, debriefing, and minimising harm.

How should data be analyzed in a Paper 4 planning question?

Data analysis should use descriptive statistics, such as measures of central tendency (mean, median, mode) and measures of spread (range, standard deviation).

What is the difference between ecological and temporal validity?

Ecological validity refers to how realistic the task and setting are to everyday life, while temporal validity refers to whether findings remain true over time.

What is inter-rater reliability?

Inter-rater reliability is the degree to which two or more different researchers agree on the observations or data they have recorded.

What is a Randomised Control Trial (RCT)?

An RCT is a method often used in clinical psychology where patients are randomly assigned to either a treatment group or a control group to test effectiveness.

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