The relationship between enterprise architecture (EA) and enterprise resource planning (ERP) systems can be a synergistic one, leading to improved organizational and IT capabilities, practices, and mission success. However, in examining this relationship, organization size must be considered since it plays an important role in influencing the success of these enterprise initiatives. This paper analyzes the responses of IT professionals to the SIM Information Management Practices Survey and discusses the relationship of organization size to the EA and ERP relationship and to IT capabilities within organizations.