Book excerpt: A substantial fraction of the people around us suffer from personality disorders. To cope, they distort both their reality and ours. Their behavior can be baffling and puzzling, and worse, they often abuse those closest to them. The author presents a new and effective way for people to understand and recognize the three of these disorders that often lead to abusive behavior. Describing each using a single dynamic - an underlying motivation - rather than a list of behaviors is an easier way to grasp and deal with these disorders. He then describes the psychological defense mechanisms that stabilize the distorted world created by the disordered, and explains how substance abuse adds fuel to the fire of disordered behavior. he also offers the latest thinking on the prospects for improvement with treatment, and a realistic perspective on the likelihood that the disordered will choose this path.