It’s very difficult to select one part of the DPP over the others. If I were to select one I would have to say scope management plan. This determines how the project scope should be defined, developed and verified. I think a skilled team makes development that much easier. It’s certainly not a requirement. I can’t say the same for the project scope. This is the backbone of the project and without it there simply is no project. There was mention of Gantt charts helping to simplify the planning process. There’s also the Work Breakdown Structure which helps to subdivide the project scope.