Adoption of Information Technologies (ITs) is a crucial decision for the growth, productivity, competitiveness, and even survival in a competitive market. Organizations adopt IT innovations to sustain their competitive position as well as to create competitive advantage. Tornatzky and Fleischer (1990) developed a framework named TOE that comprises three key determinants that affect organizational adoption: technology, organization, and environment. This framework has been used successfully in the study of adoption within organizations. Based on this framework, the purpose of this paper is to conduct a systematic review of the literature to understand important adoption factors of Information Technologies in organizations.