This document discusses four methods of studying psychology: introspection, observation, experimentation, and case study. It provides details on what each method involves, its advantages and limitations. Introspection involves observing one's own mental states, while observation looks at the mental processes of others. Experimentation uses controlled experiments in a laboratory setting. Case study analyzes an individual's behavior by reviewing their past and present circumstances. Each method provides a different perspective but also has limitations in terms of subjectivity, resources required, and applicability to different situations.