Enterprise Systems are high cost propositions as they place tremendous demands on organization's time and resources. Successful investments in Enterprise Systems require a sound understanding of the acquisition and implementation processes of these enterprise-wide systems. The ERP Implementation literature contains many examples of organizations that have implemented successfully. However, there have been cases where organizations did not achieve success due to wrong acquisition of ERP systems. Few studies have scientifically developed and tested constructs that represent critical success factors of ERP acquisition projects. Based on a survey of 53 organizations in Australia, the results suggest 60 item instrument measures ten dimensions of CSFs of ERP acquisition is well validated. It is argued that model proposed in the paper is valuable to researchers and practitioners interested in acquiring Enterprise Resource Planning systems.