Empirical data based on actual system use is in very short supply. How many transactions do ERP system users execute? In which business processes do most users still pl ay an active role? Answers to these questions are provided in the analysis of 77 user organizations, the subject of this publication. For the first time, these questions can be answered objectively, based on data collected with system-based analyses of liv e post -implementation SAP systems . The analyses examined activities of over 253,000 users and the data was extracted using RBE Plus, a reverse business engineering tool. Areas of intense usage and user types have been identified objectively, and the findin gs pinpoint specific sub -processes that reveal potential for improvement.