Mental health assessment involves gathering information about symptoms, behaviors, and functioning to diagnose mental disorders. Professionals use clinical interviews, psychological testing, and standardized systems like the DSM-5 and ICD-11 to evaluate the presence, severity, and impact of symptoms. Assessment tools include structured interviews, rating scales, and psychological tests. The clinical interview process is crucial, involving rapport-building, open-ended questions, and mental status examination. Interpreting results requires integrating multiple sources of information and considering ethical implications, cultural factors, and potential limitations.