Supervision is an essential constituent of analytic and psychotherapy training and a crucial part of ongoing professional development for all practitioners. In spite of this, little formal theory about supervision has been developed and, for the most part, learning to supervise has progressed using a simple apprenticeship model. This text aims to rectify this situation. Jan Wiener, Richard Mizen and Jenny Duckham draw together contributions from a number of experienced Jungian analysts who supervise to explore key aspects of the supervisory experience with the aim of developing a theory for analytically-based work. Part one explores the nature of the supervisor-supervisee relationship, Part two looks at a number of the settings and applications of supervision and Part three examines problems that might occur in supervision. In the fourth and final part, and drawing on the previous chapters, the focus turns specifically to the challenges of developing a clear theory of supervision.