This chapter firstly considers attachment theory and the role of early experiences in the development of perceptions of self and world. This is followed by a discussion of the role of such perceptions in psychopathology in general and in OCD specifically. Next, a model of obsessive-compulsive vulnerability is developed, incorporating current understandings of self-concept and world-view into a model of susceptibility to the development of obsessive-compulsive symptoms and cognitions. The role of parent-child interactions in the generation of such vulnerability is then explored before the hypotheses are presented. Overall, it is argued that consideration of the individual's perception of self and world view may lead to a broader understanding of the development and maintenance of OCD.