Freudian theory has been rejected by many researchers. It included some complicated explanations for behaviour that has been explained more easily with other theories. Which principle led researchers to reject Freudian theory in this case?

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The principle of parsimony, often applied through Occam's Razor, suggests that among competing hypotheses, the one with the fewest assumptions should be selected. Freudian theory, with its complex and often untestable explanations, was rejected in favor of simpler, more empirically testable theories.

Freudian Theory Has Been Rejected by Many Researchers