A vendor's statement of work (SOW) will need to have its steps rendered in the WBS. Even though a vendor is going to do the work as part of a purchasing bargain, you still need to plan for the steps and accommodate the person-hours, materials, and time that they'll take. There may well be dependencies between the tasks in your project and the steps outlined in a vendor's SOW—things you must have ready before the vendor's employees can come in and do what they need to do, or vice versa.
Include a copy of every SOW involved in the process in your project book. When delineating steps in your WBS that are accomplished by a given SOW, refer to that SOW in the WBS if more information is needed.
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