Clinical assessment involves gathering information to understand abnormal behavior and determine how to help an individual. It can follow three models: the info-gathering model focuses on collecting relevant data; the therapeutic model aims to evaluate treatment progress; and the differential treatment model seeks to determine the best treatment approach. Common assessment methods include clinical interviews, intelligence and personality tests, and behavioral observations. Projective tests like the Rorschach inkblot technique and TAT are also used to reveal unconscious thoughts and feelings.