Continuous failures in ERP systems implementation project are today the main challenge in the feasibility of integrated information systems. Failure can be determined by different factors, both from technological side and organizational side, if not well managed. In this paper, we propose a methodological approach based on technochange management in order to assess the feasibility of ERP implementation strategy and reduce the risk of failure in terms of project metrics and early operational metrics. A case study in a big Italian Telecommunication Firm will be presented.