Psychological Types is one of Jung's most important and famous works. It is the book that introduced the world to the terms 'extravert' and 'introvert'. Though very much associated with the unconscious, in Psychological Types Jung shows himself to be a supreme theorist of the conscious. In putting forward his system of psychological types Jung provides a means for understanding ourselves and the world around us: our different patterns of behaviour, our relationships, marriage, national and international conflict, organizational functioning. This Routledge Classics edition includes a new foreword by John Beebe.