It doesn't take into account individual differences of the p's e.g. mental disorder. Therefore is nomothetic.
Research is done in an artificial environment so it may lack ecological validity. e.g. L+P EWT
It reduces complicated behaviour to a small number of variables so various equally valid explanations are ignored. It is Reductionist. e.g. biological approach
Something of the set up of the study might make it invalid; it may lack internal validity. e.g. demand characteristics through leading questions.
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