Presents the foundations of major theories of personality. Volume 1 describes specialized theoretical models and demonstrates the impact that personality has on functioning. Volumes 2 and 3 describe the major classifications of psychological disorders in adults and children as well as the most popular treatment modalities. Throughout the work, researchers and clinicians present data reflecting the influence of personality and psychological problems on an individual's ability to interact with family and peers, and perform in the work or school environment, a feature unique to this reference work.