Enterprise Resource Planning (ERP) systems continue to represent one of the largest IT investments in organization and increasingly becoming one of the prerequisites for doing business in many industries. Many companies worldwide have adopted ERP systems for variety of reasons, including cost reduction, integration of business processes and faster information transactions. ERP Implementation and critical success factors have been extensively researched but few studies have investigated the success of the system. This study develops a model based on the information system's research to identify success measures.