Post – Behaviouralism is result of dissatisfaction with Behaviouralism Values are ignored in Behaviouralism research and importance is given only to facts. Behaviouralism asserts that study of values is weakness of scientific approach and science means facts – based study, whereas Post – Behaviouralism believes that both values and facts are relevant and useful for study. Thus, it is unnatural to differentiate between these two facets of Political Science, which in true sense, should be alive in both ways, scientific and political. Thus, importance of values in study of Political Science cannot be ignored.