Wilhelm Wundt was the founder of structuralism whereas William James was the founder of functionalism. In Psychology, structuralism aims to analyze the adult mind by knowing the simplest components and how these fit together in complex forms. The mind is defined as the sum of total experience from birth to present of an individual. In structuralism, introspection which is a careful set of observations made under controlled conditions by trained observers using descriptive vocabulary plays an important role. On the other hand, functionalism states that the empirical, rational thought over an experimental, trial-and-error philosophy is really important. The psychologists were more concern with the capability of the mind than with the process of thought. This presents the idea that mental states like the beliefs, desires, etc. are constituted solely by their functional role.
