While the book necessarily reviews fundamental concepts in object relations theory, it isn't a survey book. Ogden has an agenda. He sees what the theorists explicitly contributed but is more interested in the implicit contributions and consequent extensions of the main object relations theories. He provides a deeper understanding of key concepts, such as projective identification, and convincingly argues for the necessity of guiding patients through a developmental reparative experience. His extensions are mainly based on Winnicott's work, especially using his idea of 'potential space', 'illusion', and 'playing'. Its a fascinating book, deceptively simple, philosophically sound, and well written (easy to read). He communicates very clearly, and as good communicators do he makes his ideas sound simple yet they are not. Its one of the few books I've read recently that I feel definitely contributed favorably to my work and had immediate practical application.