The Project Execution Plan
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The Project Execution Plan is the development of the scope description included in the Project Charter.
A Project Execution Plan is essentially a document summarising what the agreed project outputs (deliverables) and responsibilities are. It will include the responsibilities of the project team and any other major stakeholders. Finally, operational planning for the project (budgeting, risks & issue management, quality control, reporting procedures, resource scheduling etc.) is included to show how results signed off in the project/programme purpose Case will be delivered and measured.
You need to document the linkage between your project scope description, the staffing and procurement estimates, and the schedule and then iterate these until they fit the organizational goals and constraints. Create a "project plan" document, and use this plan to communicate to stakeholders the assumptions and intentions of the project effort.
Break your project into phases, inorganizational the phases into your Project Schedule.
Identify project risks, i.e. areas of your project where there is uncertainty, with potential for significant negative consequences. Add your list of risks and your risk management actions to your project plan and communicate them clearly at management review meetings.