Final answer:
The project management plan is an essential document created during the planning process of project management after the preparatory phase. It serves as the foundation for the implementation, evaluation, and lessons learned phases of a project.
Step-by-step explanation:
The project management plan is the output of the planning process within project management. This plan is created after the initial preparatory phase, which includes the development of the project charter, defining the scope, and identifying stakeholders.
The subsequent phases, the implementation and learning phase, program evaluation phase, and the development of lessons learned, all depend on the thoroughness and accuracy of the project management plan.
It is a comprehensive guide that includes baselines for scope, cost, and schedule; management plans for scope, requirements, changes, risk, quality, communication, and procurement; and other subsidiary plans and documents.