Chapter 15 begins with descriptions of five different people each with a different mental disorder and then goes on to explain how the concept of mental disorder is not an easy one to define. Explanations and treatments for mental disorders have not always been clear cut, some disorders may even stem from culture. In order to diagnose these types of disorders easily something known as the Diagnostic Statistical Manual of Mental Disorders (DSM) was created in 1952. The book then goes on to mention multiple different classes of disorders such as anxiety, which is among the most prevalent disorders, mood disorders and suicide, such as depression and bipolar disorder, schizophrenia, which is questionably the most severe, and last childhood disorders, such as autism and ADHD. Each of these disorders are defined and discussed in great depth in this chapter.