This issue of Neurologic Clinics addresses movement disorders and contains the following articles: Etiogenesis of Parkinson's Disease; Medical Treatment of Parkinson's Disease; Surgical Treatment of Movement Disorders; Tremor: Clinical Features, Pathophysiology and Treatment; Dystonia: Genetics and Treatment; Huntington's Disease and Other Choreas; Tourette's Syndrome: Clinical Features and Treatment; Myoclonus: Pathophysiology and Treatment; Restless Legs Syndrome; Psychogenic Movement Disorders; and Peripherally-Induced Movement Disorders.