An overall project schedule is required to determine complete project timescale, resource requirements and costs. A more detailed schedule is required to manage and control the project. This more detailed schedule is developed progressively through the project by producing a schedule for the next stage during Project Initiation and towards the end of subsequent project stages. The overall project schedule provides a overview of the activities in the stage. These activities need to be further defined to the point where all necessary tasks have been identified. This should use the same approach as for developing the overall project schedule. That is, using a proven.
