Evaluation: Untestable concepts (limitation)
Much of the approach is untestable.
Karl Popper argued that the approach doesn't meet the scientific criterion of falsification, and not open to empirical testing.
Many concepts were criticised as they are said to occur at an unconscious level, making them impossible to test.
Ideas were based on the subjective study of single individuals, Little Hans, makes it difficult to make universal claims about human behaviour.
Freud's theory was pseudoscientific rather than an established fact.