This paper formulates a model of the most important mechanisms of effective change management in enterprise resource planning systems. This ‘ERP Change-Management Model’ was developed after a comprehensive review and synthesis of IT change literature that encompassed the fields of IT project management, business process reengineering, IT innovation adoption, and enterprise resource planning systems. Ten change management mechanisms were identified as important in motivating ERP users to embrace change and to learn to use an ERP system effectively. An adequate budget for change resources is the facilitating condition for these change management mechanisms.