The main thesis of this book is the concept that schizophrenia represents a developmental disturbance in the capacity to experience, perceive and represent boundaries. Many of the impairments in cognitive, perceptual, and interpersonal functioning described for schizophrenia can therefore be understood as manifestations of this boundary disturbance. The authors develop their hypothesis systematically by reviewing empirical and clinical material in the literature on schizophrenia and by presenting clinical data that deal with the cognitive processes, the sense of self and interpersonal relationships. Further, they attempt an integration of the developmental psychology of Piaget and Werner with the psychoanalytic theory of boundary development in object relationships. This integrated formulation provides a model which the authors believe is capable