Have you ever felt there is more than one you? That sometimes you are one type of person, sometimes another? Do you ever find yourself saying "yes" when you meant to say "no"? Or deciding to do one thing, then actually doing another? Most of us have had experience of another personality apparently causing us to behave in an unintended way. The author attempts to show how each of us is made up of a number of "subpersonalities". Some may help, some may hinder us. To be in charge of our inner world we had better find out who they are and what they do. This book is designed, with questionnaires and simple exercises, to enable us to do this.