“Good judgment is the result of experience,” he said. “The way to become a good project manager is to have bad experiences and learn from them.” A review of the literature uncovered three categories of knowledge regarding the contribution of earned value management success. A large literature offers rational support for the positive contribution of EVM [48], [50]. Work of this type suggests the benefit of EVM in key project management processes, including planning, execution, monitoring and control (PMBOK, 2004). Another source of knowledge comes from the experiential accounts of project professionals [49]. These works are important because, unlike theory, they offer empirical evidence based on personal experience and observations. A third source of knowledge about the contribution of EVM to project success combines theory and experience [48]. These works offer the highest level of precision in both methodology and results and can be said to offer scientific knowledge. The works in this category are research-oriented and to date rely on a qualitative method to be relevant