Why is "Stating the same-sex effect vaguely" a common mistake in Bandura et al. (Aggression)?

Why it happens: Students remember 'children copied' but not the detail. How to avoid it: Be specific: imitation of same-sex models was strongest for BOYS copying the MALE model's physical aggression. Source: 9990 mark schemes

Why is "Calling the study operant conditioning" a common mistake in Bandura et al. (Aggression)?

Why it happens: It involves learning. How to avoid it: This is SOCIAL LEARNING (observation + imitation), not operant conditioning — children weren't directly reinforced for hitting the doll.

Why is "Ignoring the matched-pairs design in evaluation" a common mistake in Bandura et al. (Aggression)?

Why it happens: Students forget it. How to avoid it: Matching on pre-existing aggression is a key strength (controls a confound) — use it in 'strengths' answers.

Why is "When 'use of children' is the named issue, only discussing ethics" a common mistake in Bandura et al. (Aggression)?

Why it happens: Students equate children with consent. How to avoid it: Cover BOTH ethics (consent/harm) AND necessity (must use children to study how children learn).

Why is "Claiming the study 'proves' media causes real violence" a common mistake in Bandura et al. (Aggression)?

Why it happens: Over-extending the conclusion. How to avoid it: It shows children imitate observed aggression toward a Bobo doll (immediate). It SUGGESTS media may matter — it doesn't prove real-world violence.

Learning Approach (AS Level)Cambridge International A Level Psychology 9990

Bandura et al. (Aggression)

Work through the notes, try the practice questions, then take the quiz. The report tells you exactly what to revise next.

Previous Next

Learn this Topic

Start with the slides for the quick version, then go deeper with the full study notes.

Short Study Notes in the form of Slides

Read the notes first. If the method in a worked example clicks, you're ready for the questions.

Short Study Notes — Bandura et al. (Aggression)

Start with these resources to cover the key concepts, then work through the practice questions.

Page 1 / 0

Detailed Notes

Full prose, callouts and a recap — built for A* mastery, not just a quick scan.

Take these study notes with you

Download a branded PDF — full prose, callouts, recap and memorise list for Bandura et al. (Aggression), ready to print or save offline.

Bandura et al. (Aggression / Bobo Doll) — Cambridge AS & A Level Psychology 9990 Study Notes (2024-2026)

The learning core study showing children imitate adult aggression. This note builds social learning theory (modelling, vicarious reinforcement, mediational processes), then drills the matched-pairs experiment, the conditions, the exact results, and how to evaluate it in context.

At a glance

Reference: Bandura, A., Ross, D. & Ross, S.A. (1961) — transmission of aggression through imitation of aggressive models.
Psychology investigated: social learning theory and aggression.
Aim: test whether children imitate aggression shown by an adult model, and whether model sex and child sex matter.
Method: laboratory experiment, matched-pairs design; observation (one-way mirror, behavioural categories).
Sample: 72 children (36 boys, 36 girls), aged 3–6, Stanford University Nursery School.
Conditions: aggressive model / non-aggressive model / control; male or female model.
Key result: children who saw the aggressive model imitated more aggression; boys more physically aggressive; more imitation of same-sex models.
Conclusion: aggression can be learned by observation and imitation — strong support for social learning theory.

What you’ll learn

Mapped to the Cambridge International A Level 9990 syllabus (2024-2026).

Outline the psychology being investigated: social learning theory and aggression.
Explain social learning theory — modelling, identification, vicarious reinforcement and the four mediational processes.
Describe the aim, sample, conditions and procedure (including the Bobo doll and behavioural categories).
Describe the results and the conclusion that aggression is learned through imitation.
Evaluate the study (control, ethics, ecological validity) and relate it to issues and debates.

Social learning theory in depth (background substance)

We learn by observing and imitating models — especially ones we identify with — via attention, retention, reproduction and motivation.

This study is the classic demonstration of social learning theory (SLT) — so understanding SLT lets you explain it, not just describe it.

Learning by observation and imitation. SLT says we learn behaviours by watching others (models) and imitating them. Unlike pure conditioning, learning can happen without doing the behaviour ourselves and without being directly reinforced.

Identification. We are more likely to imitate models we identify with — those who are similar to us (e.g. same sex), admired, or high status. This is why Bandura predicted children would copy same-sex models more.

Vicarious reinforcement. We're more likely to copy behaviour we see being rewarded in others (and less likely if we see it punished). The model's consequences shape our imitation.

The four mediational (cognitive) processes that must occur for imitation:

Attention — you must notice the behaviour.
Retention — you must remember it.
Reproduction — you must be physically able to copy it.
Motivation — you must want to do it (often driven by expected reinforcement).

These cognitive steps are why SLT is sometimes called a 'bridge' between behaviourism and the cognitive approach: it adds thinking to learning. Knowing this gives you a ready evaluation point — SLT is less reductionist than pure conditioning.

SLT = learning by observing + imitating models (no direct reinforcement needed).
Identification → we copy similar/same-sex/high-status models more.
Vicarious reinforcement → copy behaviour seen being rewarded.
Mediational processes: attention → retention → reproduction → motivation.
SLT bridges behaviourism and cognition (adds thinking).

Psychology investigated and aim

Will children imitate an aggressive adult model, and does model/child sex matter?

Psychology being investigated: social learning theory and aggression.

Aim. To investigate whether children would imitate aggression that they had observed in an adult model, even when the model was no longer present, and to test specific predictions:

Children who see an aggressive model will imitate that aggression (more than children who see a non-aggressive model or no model).
Boys will be more aggressive than girls (especially physically).
Children will imitate same-sex models more than opposite-sex models.

Topic: social learning theory + aggression.
Prediction 1: aggressive-model children imitate more aggression.
Prediction 2: boys more (physically) aggressive than girls.
Prediction 3: more imitation of same-sex models.

Sample, conditions and procedure

72 children matched on aggression; watch an aggressive/non-aggressive model; then observed with a Bobo doll.

Sample: 72 children (36 boys, 36 girls), aged 3–6 (mean ≈ 4 years), from Stanford University Nursery School.

Design: a matched-pairs design — children were matched on their pre-existing aggression (rated by teachers/observers) so the groups were comparable. Conditions:

Aggressive model, non-aggressive model, or control (no model).
Model was male or female.
Child was a boy or a girl.

Procedure (three stages):

Modelling. The child plays in one corner; an adult model is in another corner with a Tinker-toy set, a mallet and a 5-foot inflatable Bobo doll. In the aggressive condition the model attacks the Bobo doll in distinctive physical and verbal ways — hitting it with the mallet, kicking and throwing it, sitting on it and punching its nose, while saying things like "Sock him on the nose" and "Pow". In the non-aggressive condition the model plays quietly and ignores the Bobo.
Aggression arousal. The child is taken to a room with attractive toys but told these are reserved for other children — a mild frustration to arouse some aggression.
Test for delayed imitation. The child is taken to a room containing both aggressive toys (Bobo, mallet) and non-aggressive toys, and observed through a one-way mirror for 20 minutes. Behaviour is coded into categories: imitative physical aggression, imitative verbal aggression, partially imitative, and non-imitative aggression (e.g. gun play).

72 children (36 M, 36 F), aged 3–6; matched on pre-existing aggression.
Conditions: aggressive / non-aggressive / control; male or female model.
Stage 1: model (aggressive or not) acts on the Bobo doll.
Stage 2: mild frustration (toys reserved for others).
Stage 3: 20-min observation via one-way mirror; behaviour coded into categories.

Results

Aggressive-model children imitated more aggression; boys more physical; same-sex imitation stronger.

Imitation of aggression. Children who saw the aggressive model reproduced a lot more physical and verbal aggression (often the exact acts modelled) than children in the non-aggressive or control conditions.
Sex of child. Boys showed more physical aggression than girls overall. Girls showed more verbal aggression in some comparisons.
Same-sex modelling. Children imitated same-sex models more — this was especially strong for boys imitating the male model's physical aggression.
Non-aggressive model. Children who saw the non-aggressive model showed very little aggression — in some measures even less than the control group.

Aggressive-model children imitated far more aggression (often exact acts).
Boys > girls for physical aggression.
Same-sex imitation stronger (esp. boys + male model).
Non-aggressive model → very little aggression.

Conclusions

Aggression can be learned through observation and imitation, supporting social learning theory.

Aggression can be learned simply by observing and imitating a model — children did not need to be directly reinforced to copy it. This strongly supports social learning theory.
Identification matters: children imitate same-sex models more, consistent with SLT.
The findings suggest that exposure to aggressive models (including in the media) could increase children's aggression — a key real-world implication.

Aggression is learned by observation/imitation (no direct reinforcement needed).
Same-sex models are imitated more (identification).
Implication: exposure to aggressive models (media) may raise aggression.

Evaluation — strengths, weaknesses, issues & debates

High control and a matched-pairs design, but serious ethical concerns and low ecological validity.

Strengths

High control / standardised lab experiment with a matched-pairs design (matched on aggression) → can infer cause and effect, and is replicable.
Objective observation using behavioural categories coded via a one-way mirror → reliable (high inter-rater reliability), quantitative data.

Weaknesses

Ethical concerns (use of children) — exposing 3–6 year-olds to aggression and deliberately frustrating them risks psychological harm, and they cannot give full informed consent; teaching aggression that might persist is a protection-from-harm issue.
Low ecological validity — a Bobo doll is designed to be hit and is not a real person, so 'aggression' towards it may not reflect real interpersonal aggression; the situation is artificial/novel.
Demand characteristics — children may have thought they were expected to hit the Bobo doll.
Generalisability — all children came from Stanford University Nursery School, a narrow sample.

Issues & debates

Nature vs nurture: strong support for nurture (aggression learned by imitation).
Use of children: ethics (consent, harm) vs scientific value.
Application to everyday life: debates on media violence, TV regulation and parenting.
Individual vs situational: mainly situational (the model causes the behaviour).

Strength: control + matched pairs → cause and effect, replicable.
Strength: behavioural categories observed via one-way mirror → reliable, objective.
Weakness: ethics — exposing/frustrating young children (harm, consent).
Weakness: low ecological validity — a Bobo doll isn't a real person; demand characteristics.
Debates: nature vs nurture (nurture); use of children; media-violence application.

How it’s examined

Paper 1 Section A: short-answer (e.g. 'state the design', 'name one behavioural category', 'outline one result'). Section B: describe (~6 marks) and evaluate (8–10 marks), very commonly with use of children or ecological validity as the named issue. Examiner guidance: state the same-sex result precisely, quote the matched-pairs design as a strength, and keep ethics points in context (3–6 year-olds, deliberate frustration).

Sources: Cambridge International AS & A Level Psychology 9990 syllabus (2024-2026); Bandura, A., Ross, D. & Ross, S.A. (1961) Journal of Abnormal and Social Psychology, 63(3): 575-82; 9990 Learner Guide & Scheme of Work (for examination from 2024); 9990 Specimen / past Paper 1 and mark schemes. Last reviewed 2026-05-21.

Master this Topic

Worked examples, formulae, definitions and the mistakes examiners flag — everything you need to push from a pass to an A*.

Take this whole topic with you

Download a branded revision sheet — worked examples, formulae, definitions and common mistakes for Bandura et al. (Aggression), ready to print or save as PDF.

Step-by-step worked examples — Bandura et al. (Aggression)

Step-by-step solutions to past-paper-style questions on bandura et al. (aggression), written exactly the way a tutor would explain them at the board.

1State the design (2 marks)
Getting started• design, AO1
Question
State the experimental design used by Bandura et al. and what the children were matched on. (2 marks)
Step-by-step solution
1. Step 1
  Design: matched-pairs (a laboratory experiment).
2. Step 2
  Children were matched on their pre-existing aggression (rated beforehand).
Answer
Matched-pairs design; matched on pre-existing aggression. (2)
Examiner tip
The 'matched on aggression' detail is the key markable fact and a ready strength for evaluation.
2Name behavioural categories (2 marks)
Getting started• procedure, AO1
Question
State two behavioural categories used to record the children's aggression. (2 marks)
Step-by-step solution
1. Step 1
  Imitative physical aggression (copying the model's physical acts).
2. Step 2
  Imitative verbal aggression (copying the model's words, e.g. 'Pow').
Answer
Imitative physical aggression; imitative verbal aggression. (2)
Examiner tip
Other acceptable: partially imitative; non-imitative aggression (e.g. gun play). Any two score.
3Explain the matched-pairs design (4 marks)
Building confidence• design, AO2
Question
Explain why Bandura et al. used a matched-pairs design. (4 marks)
Step-by-step solution
1. Step 1
  Children were rated on their existing aggression before the study.
2. Step 2
  They were then matched and split across conditions so groups had similar aggression levels.
3. Step 3
  This controls the participant variable of natural aggressiveness (a confounding variable).
4. Step 4
  So any difference in imitation is more likely due to the MODEL, not pre-existing differences — increasing validity.
Answer
Children were matched on pre-existing aggression so groups were comparable; this controls a confounding variable, so differences in imitation can be attributed to the model. (4)
Examiner tip
AO2 marks come from explaining the LOGIC (controls a confound → valid causal claim), not just naming the design.
4Outline the results (4 marks)
Building confidence• results, AO1
Question
Outline the results of Bandura et al.'s study. (4 marks)
Step-by-step solution
1. Step 1
  Children who saw the aggressive model imitated more aggression (physical and verbal) than other groups.
2. Step 2
  Boys showed more physical aggression than girls.
3. Step 3
  Children imitated same-sex models more — strongest for boys imitating the male model.
4. Step 4
  Children who saw the non-aggressive model showed very little aggression.
Answer
Aggressive-model children imitated more aggression; boys > girls (physical); same-sex imitation stronger (esp. boys + male model); non-aggressive group showed little aggression. (4)
Examiner tip
State the same-sex effect precisely (boys copying the male model). Vague 'children copied the model' misses marks.
5Describe the procedure (6 marks)
Stretch• procedure, AO1, Paper 1
Question
Describe the procedure of Bandura et al.'s study. (6 marks)
Step-by-step solution
1. Step 1
  72 children (36 boys, 36 girls, aged 3–6) were matched on aggression and assigned to aggressive/non-aggressive/control conditions, with a male or female model.
2. Step 2
  Stage 1 (modelling): the child played in one corner while the adult model (in another) either attacked a Bobo doll (aggressive) or played quietly (non-aggressive).
3. Step 3
  The aggressive model used distinctive acts — hitting with a mallet, kicking, punching the nose — and phrases like 'Sock him on the nose'.
4. Step 4
  Stage 2 (arousal): the child was mildly frustrated by being shown attractive toys then told they were for other children.
5. Step 5
  Stage 3 (test): the child was observed for 20 minutes through a one-way mirror in a room with the Bobo doll and other toys.
6. Step 6
  Behaviour was coded into categories (imitative physical/verbal, partially imitative, non-imitative aggression).
Answer
72 matched children; aggressive/non-aggressive/control + male/female model; model acts on Bobo; mild frustration; 20-min observation via one-way mirror; behaviour coded into categories. (6)
Examiner tip
Top band needs the three stages, the conditions, and the coded observation. Mentioning the distinctive acts helps the 'imitation' point.
6Evaluate — use of children (4 marks)
Stretch• evaluation, AO3, use-of-children, exam-technique
Question
Evaluate Bandura et al.'s study with reference to the use of children in research. (4 marks)
Step-by-step solution
1. Step 1
  Ethics. The children (3–6) were exposed to aggression and deliberately frustrated, risking psychological harm.
2. Step 2
  Consent. Young children cannot give full informed consent, so this relies on others' consent.
3. Step 3
  Lasting effect. Imitating aggression could persist beyond the study — a protection-from-harm concern.
4. Step 4
  But necessary. To study how children learn aggression, children must be tested — though the harm must be minimised.
Answer
Exposing/frustrating 3–6 year-olds risks harm and they can't fully consent; imitated aggression may persist — but children are necessary to study child learning. (4)
Examiner tip
When 'use of children' is the named issue, cover BOTH the ethics AND the necessity/value.

Model Answers — Bandura et al. (Aggression)

High-scoring sample answers for bandura et al. (aggression) on the Cambridge International A Level 9990 paper, with examiner-style notes mapping each response to the mark scheme and assessment objectives.

Question 1
9990 Paper 1 Section B (describe) style6 marks
Q (6 marks). Describe the sample and procedure of Bandura et al.'s study.
Model answer
Bandura et al. studied 72 children (36 boys and 36 girls), aged 3–6, from Stanford University Nursery School. Using a matched-pairs design, the children were matched on their pre-existing aggression and assigned to one of three conditions — aggressive model, non-aggressive model or control — with the model being either male or female.

In stage 1, each child played in one corner of a room while the adult model was in another. In the aggressive condition the model attacked a 5-foot inflatable Bobo doll in distinctive ways — hitting it with a mallet, kicking it and punching its nose — while saying phrases such as "Sock him on the nose"; in the non-aggressive condition the model played quietly and ignored the doll. In stage 2, the child was mildly frustrated (shown attractive toys, then told they were reserved for other children). In stage 3, the child was observed for 20 minutes through a one-way mirror in a room containing the Bobo doll and other toys, and their behaviour was coded into categories such as imitative physical and imitative verbal aggression.
Why this scores
Why this scores well. It covers sample, the matched-pairs design, the conditions, all three stages and the coded observation — the breadth the top band rewards.
Question 2
9990 Paper 1 Section B (evaluate) style10 marks
Q (10 marks). Evaluate the study by Bandura et al. in terms of two strengths and two weaknesses. At least one of your evaluation points must be about the use of children in research.
Model answer
Strength 1 — high control and a matched-pairs design. As a laboratory experiment, variables such as the model's behaviour were tightly controlled, and the matched-pairs design matched children on pre-existing aggression. This controls a key confounding variable, so differences in imitation can be attributed to the model, supporting a causal claim, and the standardised procedure makes the study replicable.

Strength 2 — objective, reliable observation. Behaviour was coded into clear behavioural categories by observers watching through a one-way mirror, producing quantitative data with high inter-observer reliability.

Weakness 1 — use of children (named issue). The children were only 3–6 years old, were exposed to aggression and were deliberately frustrated. They could not give full informed consent, and learning aggression that might persist raises a serious protection-from-harm concern — though studying children is necessary to investigate how children learn.

Weakness 2 — low ecological validity. A Bobo doll is designed to be hit and is not a real person, so 'aggression' towards it may not reflect real interpersonal aggression. The novel, artificial situation may also have produced demand characteristics (children guessing they were meant to hit it).

Conclusion. The control and matched-pairs design make the central finding (children imitate modelled aggression) convincing, but the ethical issues of using young children and the artificiality of hitting a Bobo doll mean its conclusions about real aggression should be drawn with caution.
Why this scores
Why this reaches the top band. Two strengths and two weaknesses, the named issue (use of children) covering ethics AND necessity, every point in context (PEEL), and a reasoned conclusion (AO3).
Question 3
9990 Paper 1 Section B (describe) style6 marks
Q (6 marks). Describe the results and the conclusion of Bandura et al.'s study.
Model answer
Results. Children who watched the aggressive model reproduced far more aggression — often the exact physical and verbal acts they had seen — than children in the non-aggressive or control conditions. Boys showed more physical aggression than girls. Children imitated same-sex models more, an effect that was strongest for boys imitating the male model's physical aggression. Children who saw the non-aggressive model showed very little aggression.

Conclusion. Bandura et al. concluded that aggression can be learned through observation and imitation — children copied the model without needing to be directly reinforced, strongly supporting social learning theory. The greater imitation of same-sex models supports the role of identification. The findings imply that exposure to aggressive models, including in the media, could increase children's aggression.
Why this scores
Why this scores well. Results are precise (same-sex effect specified), and the conclusion interprets them via social learning theory and identification rather than just repeating them.
Question 4
9990 Paper 1 Section B (discussion) style8 marks
Q (8 marks). 'Bandura's study tells us little about real-life aggression.' Discuss how far you agree.
Model answer
Support for the claim. Several features limit the study's real-world relevance. A Bobo doll is an inflatable toy designed to be hit — striking it is not the same as harming a real person, so the 'aggression' measured may not reflect genuine interpersonal aggression. The setting was artificial and novel, and children may have shown demand characteristics, hitting the doll because they thought that was expected. The study also measured only immediate imitation, not lasting aggression.

Against the claim. The study still reveals a real principle — that children imitate aggression they observe in models — which has been supported by later, more realistic research and fits everyday observation (children copying behaviour from adults and the media). The strong control means the cause (the model) is clear, and the findings have shaped real debates about media violence and child-rearing, so they are far from useless.

Conclusion. The Bobo doll task is artificial, so the claim has some force — we should be cautious about treating doll-hitting as identical to real aggression. But the study demonstrates a genuine learning mechanism with real-world implications, so it tells us something important, if limited, about real-life aggression. The fairest view is that it establishes the principle, which more naturalistic research then confirms.
Why this scores
Why this reaches the top band. Balanced argument with specific evidence (Bobo doll, demand characteristics, immediate imitation), it separates 'artificial measure' from 'no real-world value', and reaches a measured conclusion (AO3).

Key Definitions and Keywords — Bandura et al. (Aggression)

Definitions to memorise and the exact keywords mark schemes credit for bandura et al. (aggression) answers — sharpened from recent examiner reports for the 2026 Cambridge International A Level 9990 sitting.

Social learning theory
Examiner keyword
Learning by observing and imitating models, especially those we identify with; influenced by vicarious reinforcement.
Modelling / model
Examiner keyword
A model is a person whose behaviour is observed and may be imitated; modelling is demonstrating a behaviour for others to copy.
Imitation
Examiner keyword
Copying the behaviour of a model — here, children reproducing the model's aggressive acts.
Identification
Examiner keyword
Relating to a model because they are similar to us (e.g. same sex) or admired, making imitation more likely.
Vicarious reinforcement
Being more likely to imitate a behaviour after seeing the model rewarded for it.
Matched-pairs design
Examiner keyword
Participants are matched on a key variable (here, pre-existing aggression) before being split across conditions, to control that variable.
Behavioural categories
Examiner keyword
Clearly defined types of behaviour recorded by observers (e.g. imitative physical/verbal aggression), supporting reliable coding.
Mediational processes
The cognitive steps required for imitation: attention, retention, reproduction and motivation.
Ecological validity
How well findings reflect real behaviour. Lowered here because a Bobo doll is not a real person.

Common Mistakes and Misconceptions — Bandura et al. (Aggression)

The traps other students keep falling into on bandura et al. (aggression) questions — taken from recent Cambridge International A Level 9990 examiner reports and mark schemes — and how to avoid them.

✕Stating the same-sex effect vaguely
9990 mark schemes
Why it happens
Students remember 'children copied' but not the detail.
How to avoid it
Be specific: imitation of same-sex models was strongest for BOYS copying the MALE model's physical aggression.
✕Calling the study operant conditioning
Why it happens
It involves learning.
How to avoid it
This is SOCIAL LEARNING (observation + imitation), not operant conditioning — children weren't directly reinforced for hitting the doll.
✕Ignoring the matched-pairs design in evaluation
Why it happens
Students forget it.
How to avoid it
Matching on pre-existing aggression is a key strength (controls a confound) — use it in 'strengths' answers.
✕When 'use of children' is the named issue, only discussing ethics
Why it happens
Students equate children with consent.
How to avoid it
Cover BOTH ethics (consent/harm) AND necessity (must use children to study how children learn).
✕Claiming the study 'proves' media causes real violence
Why it happens
Over-extending the conclusion.
How to avoid it
It shows children imitate observed aggression toward a Bobo doll (immediate). It SUGGESTS media may matter — it doesn't prove real-world violence.

Practice questions

Exam-style questions with step-by-step worked solutions. Try one before checking the method.

Past paper style quiz

Get a report showing which sub-topics you've nailed and which ones still need work.

Bandura et al. (Aggression)

Short Study Notes in the form of Slides

Short Study Notes — Bandura et al. (Aggression)

Detailed Notes

What you’ll learn

How it’s examined

1State the design (2 marks)

2Name behavioural categories (2 marks)

3Explain the matched-pairs design (4 marks)

4Outline the results (4 marks)

5Describe the procedure (6 marks)

6Evaluate — use of children (4 marks)

Social learning theory

Modelling / model

Imitation

Identification

Vicarious reinforcement

Matched-pairs design

Behavioural categories

Mediational processes

Ecological validity

✕Stating the same-sex effect vaguely

✕Calling the study operant conditioning

✕Ignoring the matched-pairs design in evaluation

✕When 'use of children' is the named issue, only discussing ethics

✕Claiming the study 'proves' media causes real violence

Practice questions

Past paper style quiz

Assess your understanding