The evolving nature of Information Technology (IT) results in changes on the decision making patterns of today’s managers in all functional areas and at all managerial levels. The patterns of decision making in organizations especially vary through different stages of adoption to new information technologies. This paper aims to understand the diffusion process of IT in organizations in both individual and organizational context, regarding different stages of adoption to different technologies, and to examine the role of IT diffusion on decision making processes in all functional areas and at all managerial levels of organizations. In order to achieve this purpose, the existing literature has been reviewed and a new research framework has been developed that will provide a basis for further empirical studies in the area.