- It often works with children who are keen to please so can give demand characteristics - Bandura - they may have imitated the model because they thought it was the right thing to do, instead of because they were learning aggression - how do we know if it was demand characteristics, have they really learned aggression, we cannot tell if this behaviour is genuine.
- If it is long term research you can suffer from subject attrition - Freud - if at the end of the study Hans could have dropped out - if you have a big sample and some drop out then you have an unrepresentative sample, the ones left are more motivated.
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