A variety of methods can be used to assist people who are suffering from mental disorder. One such therapy is insight-oriented therapy. Proponents of this approach believe that success can be achieved only if the client gains insight into the experiences that led up to his or her problem. Another type of therapy is behavior therapy. This approach attempts to make changes by using scientifically tested principles of operant and classical conditioning. Still another type of therapy is group therapy. This type of therapy involves a therapist and several clients who are all troubled by similar problems