In a context of growing need of efficiency and reliability, the companies and more specifically the nuclear specialized ones are now using project-monitoring tools to ensure the on time delivery of their projects, their quality and the control of their costs. Following these objectives, the ASSYSTEM E&OS Company, one of the world leader in the consulting in the nuclear field, has decided to implement the ORACLE’s solution: PRIMAVERA. ASSYSTEM E&OS has chosen to carry out one of its pilot project in the technical department of Tours in order to assess the difficulties of changing their processes and the added value of such a tool. My mission consisted in being the bridge between the operation realization team and the pilot unit in Tours both in the technical and change management aspects. As for any job, my first task was to understand the specificities of the company and master the tools that were to be implemented. Moreover, I had to be also trained to the project management by learning the PMBok (Project Management Body of Knowledge) in order to be more aware of the major tasks performed by the management teams. A second step of tool specification followed this first one of subject appropriation. In this step, it was paramount to understand the needs of the teams and decide which projects were in the scope of the pilot phase. To do so, several meetings were organized. The main goal of these meetings being the clarification of the definition of the specific requirements of the Tours’ agency. Besides, those meetings have secondary goal of assessing the tools’ abilities and their adequacy with our requirements. Following this specification phase, we had to organize a course for the different software including the preparation of methods handbooks. The last, but not the least, part of the process was to carry out the pilot project. I focused on scheduling the projects on PRIMAVERA P6 and monitor them all along the pilot phase. As a relay between the implementation team and the pilot one, I continuously needed to accompany the change process, help in the technical appropriation the different team leaders, and project managers. During that while, I was improving my skills and sharing the results with my tutor and the implementation team. It helped developing my capacities of listening to the needs and my adaptability to any situation including the troubled ones. Because of the dates of my internship, I could not follow the pilot until the end. However, a new trainee who especially focused on the implementation of the UNIFIER software is currently continuing my job. I will accompany him all along his internship and provide him guidance to successfully implement this tool.