Abstract
A case review of a twenty-two year old man suffering from Prader-Willi Syndrome, Secondary Functional Encopresis, mental retardation and aggressive behaviour is presented. Emphasis is made in assessing this man from various developmental perspectives. This includes: personality development, cognitive development, physical abilities, sexual development and family life stage. The role of a psychiatrist in treating this complex problem is established. An eclectic approach to treatment is reviewed using many therapeutic modalities found effective with the mentally handicapped. These modalities include: group therapy, play therapy, individual psychotherapy, behavioural therapy, family therapy, and use of medication. A literature review of Prader-Willi Syndrome is included.