Kant's critical philosophy was the reaction over the one sided (as Kant says) thinking of the rationalists and empiricists philosophers. A specific kind of methodology is necessary to investigate into knowledge in any field and that is also true about the philosophy. But the problem with philosophy is that the philosophers before Kant had been using the methods of other fields of knowledge to enquire the philosophical problems i.e. rationalists and empiricists used deductive and inductive methods of mathematics and natural sciences respectively. But they could not succeed in their attempts. It was Kant who first time felt the necessity of a methodology different from the empirical methods and he formulated a new method to investigate the peculiar kinds of problems of philosophy which he entitled Critical Method and Transcendental Method