This assignment delves into a case study of Derek, a 51-year-old widower diagnosed with Obsessive-Compulsive Disorder (OCD). It details his symptoms such as excessive neatness, fear of germs, and obsession over his wife's murder. The assignment explores the diagnostic criteria for OCD, treatment options including psychotherapy and pharmacotherapy like SSRIs and clomipramine, and emphasizes the long-lasting effects of behavioral therapy.