This article provides an analysis of the correlation between a competitive advantage derived from improved decision-making processes and knowledge management through enterprise content management (ECM) platforms. Therefore, it expands literature on knowledge management and explicates the relationships among knowledge management systems, ECM systems, and decision-making processes. In other words our research question is: are the ECM systems able to create value for organizations? If Yes, how? In the studied case, we have seen that decision makers achieve their best performance through improved quantity and quality of input to the decisional process, as well as better formalization of knowledge included through all phases of the process thank to the adoption of ECM systems.