This project focuses on exploring the determinants of adoption of enterprise resource planning (ERP) systems. To that end, this project attempts to advance the existing literature by examining the relationship between organizational factors and actual usage of ERP systems. There are two goals of this project: First, we introduce a new construct that is developed on the basis of change management and business process reengineering literature. This new construct captures the level of ERP systems usage ability and its determinants. Second, three alternative models are formulated to explain the relationship between the usage ability and its determinants.