Due to the persistence of failure to conduct information systems implementation projects, and because of the lack of researchers' consultation on the key factors of project management success, it is advisable to broaden the reflection on the main factors of failure and success, taking into account the contexts specific to each project. This paper lies within an exploratory approach, trying to identify the success factors of managing ERP implementation projects within companies, and proving the existence of strong interactions between the three project phases. It also tries to explain that project management should not be executed independently of the initial business plan. The methodological approach applied in this research is not part of ...