Book excerpt: It would be impossible for most of us to spend a day without coming into direct or indirect contact with dozens of people family, friends, people in the street, at the office, on television, in our fantasies and fears. Our relationships with others are the most changeable, infuriating, pleasurable and mystifying elements in our lives. Personality types, based on the ancient system of the Enneagram, will help you to enjoy more satisfying and fulfilling relationships in all areas of your life by introducing you to the nine basic personality types inherent in human nature. This knowledge will help you better understand how others think and why they behave as they do, as well as increasing your awareness of your own individual personality. Written by the leading world authority on the Enneagram, it offers a framework for understanding ourselves and those around us, as well as a wealth of practical insights for anyone interested in psychology, counselling, teaching, social work, journalism and personal management.