Final answer:
The Diagnostic and Statistical Manual of Mental Disorders (DSM) provides the 17 major classifications and more than 200 special disorders, detailed descriptions of symptoms, standardization diagnosis, and improved communication among professionals and patients.
Step-by-step explanation:
The 17 major classifications and more than 200 special disorders, detailed descriptions of symptoms, standardization diagnosis, and improved communication among professionals and patients are provided by the American Psychiatric Association's Diagnostic and Statistical Manual of Mental Disorders (DSM).