Psychological disorders are diagnosed on the basis of two classifications. i.e.. DSM or IV and ICD-X •Classification of psychological disorders consists of a list of categories of specific psychological disorders grouped into various classes on the basis of some shared characteristics. •Intemational Classification of Diseases (ICD-10) is classification of behavioural and mental disorders. •ICD-IO refers to intemational classification of diseases and its 10th revision is being used. •It is developed by WHO under one broad heading 'Mental Disorders' which is based on symptoms. (The classification scheme is officially used in India) •The American Psychiatric Association (APA) has published an official manual of psychological disorders: The Diagnostic and Statistical Manual of Mental Disorders. Vth Edition (DSM-IV)_ •It Evaluates the patient on five axes or dimensions rather than just one broad aspect of •mental disorder. •These dimensions relate to biological. psychological. social and other aspects. Uses of Classification. •Classifications are useful because they enable psychologists. psychiatrists and social workers to communicate with each other about the disorders. •Helps in understanding the causes of psychological disorders and the processes involved in their development •It helps in Clinical diagnosis.