As planning is the action undertaken before execution, it has a great importance as every investment. We identify some problematics in the planning process, and give some lightings about how to make it more efficient and reliable. We propose some methods for managing project at each detail level. We propose the extension of project manager’s concepts to all the people who are accountable for some objective or deliverable. So, there are in a single project a lot of people managing the part they are responsible for as an entire project. We propose a standard methodological kit for them, and we describe the consequences on skills and responsibilities of the project actors, and on the decisions they have to take and efforts they have to undertake to reach their objectives.