What is the difference between philosophy and science? Why is it important that we follow the scientific process in psychology?

While philosophy examines itself as well as other matters, science examines only scientific questions. ... These fundamental differences strongly militate against the view that Peirce's claim can be applied to philosophy in a natural way.

Applying the scientific method to psychology, therefore, helps to standardize the approach to understanding its very different types of information. The scientific method allows psychological data to be replicated and confirmed in many instances, under different circumstances, and by a variety of researchers.