In FULL details explain:

1. why it is important to properly define the project, identify the benefits, know the requirements, and how to measure success.
2. why the planning phase is the most challenging, yet critical to achieving success, as the project is implemented.
3. why it is important for the project implementation plan to move toward completion.
4. why you think the project closing phase is important, and should not be overlooked. How you know whether the outcomes were a success or failure.

Reference(s) please for further research