Step 1: DSM (Diagnostic and Statistical Manual of Mental Disorders).
The DSM is a widely used system for classifying psychological disorders. Published by the American Psychiatric Association, it categorizes mental health conditions and provides diagnostic criteria for each disorder.
Step 2: ICD (International Classification of Diseases).
The ICD is another system used globally for the classification of diseases, including psychological disorders. Published by the World Health Organization (WHO), it is used for both epidemiological and clinical purposes.