Projects are practically broken down into different phases in order to break down the overall project objective into substages. A further aspect is to achieve a reduction in complexity and the opportunity at the end of a phase to check whether the activities planned for the phase have been completed in the scope of their objectives (costs, schedules, results). If this is not the case, then there is an opportunity to intervene at an early stage, thus avoiding early mistakes or omissions that could be carried through until the end of the project, possibly even increasing dramatically in effect.