Statement of Work (SoW) is a project’s proposal that contains its scope, deliverables, and accomplishment criteria. The SoW can be developed prior, after, or during the Project Charter writing. The sequence of SoW & Project Charter is highly debatable in the project management community. It depends on the business case and working styles.
After the project charter and SoW are ready and approved, you create the project plan, proceeding from the chapter’s/SoW terms. The plan is the detailed map that shows the most effective way to get to the goals and objectives of the project.