SOW

It should be clear to all involved what constitutes success and failure. This means not only adequately describing the work, but establishing criteria that defines when something is successfully completed. For example, instead of the vague statement, “Vendor will produce user requirements,” the SOW should elaborate that the vendor must interview specific user groups and have them approve the requirements before the job is considered done. The more detail provided for this criteria, the better.

For more info: scope of work meaning
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