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SoW Is Not a Strategy, for goodness sake.
Nobody buys a statement of work, or would think to buy a purchase order, or hire a work order or a permanent contract. They buy services. They hire people. The statement of work is the vehicle through which that purchase is documented.
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The comparative difficulty of the Statement of Work.
HR and Procurement are both on a quest to acquire time from people to do things. One is managed via HR's job description (JD) and employment contract, and the other via Procurement or Contract's Statements of Work (SoW).