The concept of psychological ownership is used to enhance our understanding of the relationship between users and information technology professionals, and to describe the IT-business process relationship. We propose that the user-IT ownership interaction determines the role that IT professionals assume in the organization: partner, order taker, advisor or technocrat. Interviews at four major organizations support the existence of these roles, and indicate that the particular role assumed by the IT professionals is likely to be related to the value generated by IT. The study suggests that the highest IT value stems from partnership between the users and the individuals in the IT function, which requires both business process ownership by IT professionals and information system ownership by users.