Final answer:
The primary purpose of a project plan is to guide project execution by setting clear goals, planning achievable steps, and establishing an understandable evaluation process for program managers.
Step-by-step explanation:
The main purpose of a project plan is to guide project execution. This involves clearly defining your goals and objectives, understanding your audience, and making plans that are achievable and appropriate. When goals are identified, you must plan how to accomplish them, ensuring that all aspects of the project are feasible before implementation. A comprehensive project plan makes it easier to manage changes that may be required during the course of the project.
A well-structured project plan includes an evaluation process that is both straightforward and useful. It must be comprehensible to program managers, detailing the 'what' and the 'why' of the project actions. Furthermore, good project planning can also help in efficiently acquiring resources, meeting standards expectations, and reducing risk. However, its primary aim remains to streamline and direct the actual project working phases.