Books are full of methods and procedures for planning a project, but if you ask a project manager what they do when they are planning, the answer is often far from clear or definitive. It may start with some kind of engagement with the sponsor or main stakeholders to find out what they want. This is then followed by a series of iterations—seeking input from a variety of stakeholders and instantiating this into a proposed approach. The aim is to create a plan which delivers the desired outcomes within the constraints set by the project owners.
The CPPRRSS model described the 6 critical steps in planning: