Melvin Udall is a bestselling novelist living in New York. At the beginning of the film, he is an irritable, obsessive-compulsive man who withdraws from those around him. To add to his alienation, he works from home and doesn't let anyone into his apartment. His routine consists of going to the same restaurant, being served by the same waitress and eating at the same table every day. His mental disorder also manifests itself in several obsessive-compulsive actions, such as turning the locks five times and doing the same to the lights in his house. One day, Melvin's homosexual neighbor is attacked and hospitalized. Due to misfortune, Melvin is forced to watch the neighbor's dog while it recovers from the attack. At this point in the film, Melvin develops an emotional attachment to the dog and his attitude begins to change for the better. Melvin decides to help the restaurant waitress by paying his son's medical expenses. This gesture comes after he collapsed when she failed to show up for work to serve him. Towards the end of the film, Melvin takes a trip to help the neighbor and invites the waitress to accompany him. The trip doesn't go as planned, but the experience helps him learn how to communicate and have better relationships with people. Ultimately, Melvin falls in love with the waitress and is willing to learn to overcome his obsessive-compulsive lifestyle to be with her. Melvin is very likely to be diagnosed with obsessive-compulsive disorder because he meets all of the DSM-5 criteria for obsessive-compulsive disorder. It displays obsessions, which are defined by recurring, intrusive, persistent, and uncontrollable thoughts, urges, or images (Kring, Johnson, Davison &...... middle of article...... paradigm, Cognitive behavioral therapy would be the most effective treatment option for Melvin. During exposure and response prevention, individuals with obsessive-compulsive disorder are directly exposed to anxiety-provoking behaviors and thoughts. treatment learn to replace negative thoughts with positive ones Melvin's treatment should begin with exposure to each of his obsessions and gradually move from low anxiety triggers to high anxiety triggers. his obsessions should decrease significantly with social support from his newly developed relationships Finally, research shows that 75% of people with obsessive-compulsive disorder are significantly helped by cognitive behavioral therapy (Nichols).)., 2010)