Clinical assessment involves evaluating a patient's physical and mental condition to diagnose issues and plan treatment. It is a multi-step process that includes gathering information from tests, interviews, records, and examinations. The psychologist compiles a case history to understand the patient's life and determine diagnoses and treatment. Key steps are deciding what to assess, setting goals, selecting evaluation methods and standards, collecting data, making decisions, and communicating findings in a report. The goal is to use the assessment to make meaningful decisions that can impact patients' lives.