This article reports the results of a research aimed at investigating the impact of an ERP system on organizational processes and individual employees in a public sector organization (Italian Regional Council). Through a qualitative method (Focus Groups – FG) interesting results have come out: system introduction planning, organizational and technical aspects seem to be relevant issues to be addressed in order to improve ERP system’s effectiveness. Through a structured questionnaire, a larger sample of employees will be involved in the second phase, aimed at testing the constructs which emerged with the FG analysis and the relationships among them.