Epistemology is an area of philosophy which addresses the nature and validity of knowledge.
Research methodology can be considered a branch of epistemology that deals in particular with the process of generating knowledge, of finding out about things. You will learn how psychological researchers develop testable assertions, make relevant observations, and use those observations to assess the validity of their assertions. Most importantly, you will learn by doing, in conducting a research project. Research methods for the behavioral sciences. Houghton Mifflin. 2.