This document introduces several important methods used in psychology: introspection, observation, experimentation, survey methods, clinical methods, and case study. Introspection involves self-observation of one's own inner thoughts and behaviors. Observation collects data by watching subjects externally. Experimentation uses controlled conditions to analyze outcomes. Surveys distribute questionnaires or interviews to gather information from people. Clinical methods diagnose and address individuals' behavioral issues. Case studies provide an in-depth analysis of a specific person or group.