In recent years Supply Chain Management (SCM) in general and in management information systems in particular, have gained interest among researchers. However, derived from a recent analysis of the area and from many definitions used in literature, we think that there is not aclear understanding of what should be considered as a SCM system. In the same way, the minimal functional requirements for a system to be considered as an SCM information system are not yet clear. This contrasts with the existence of SCOR, a much publicised model used as standard in the SCM domain. Although SCOR does not include a definition for an SCM information system and, in fact, it leaves the system implementation at will of the companies, wethink that it can be used to provide a better definition. Thus, in the present work we intent to offer a tentative definition of SCM systems based on SCOR.