Authors of Personality Plus for Couples and other series titles, Littauer and Sweet use Hippocrates theory of four personality types as a jumping-off place. They detail the sanguine, choleric, melancholic, and phlegmatic personalities and demonstrate how the understanding of ones own personality style and those of coworkers can foster communication and allay misunderstandings. Helpful charts depict each types emotional needs, their presentation style, personality problems, and what activities they do best. The authors include several chapters on special working relationships such as spousal partnerships, multilevel, marketing, real estate, and others. The quizzes and personality information make for compelling reading, as one assigns types to friends, coworkers, and family members. Great for self-understanding and improving work relationships.