The diagnosis of mental retardation can be challenging. Like other developmental disorders, retardation can have symptoms that mimic other conditions. This program discusses ways in which the child is assessed when mental retardation is suspected. Included is information on the use of norm-referenced evaluations; diagnostic tests including CT, MRI, and other radiologic scans as well as EEG, chromosomal analysis, and blood work. Disorders that can both look like mental retardation and occur as a comorbid condition are listed. The impact on the family, the individual, and society are also discussed as is education aimed at prevention of the disorder.