This April 2015 guide outlines how to ensure compliance with the sustainability requirements included in a contract. It provides best practices that can be used during both pre-award and post-award stages of a procurements to help ensure contractors deliver the sustainable products enumerated in a contract or purchasing agreement. In addition, it provides guidance and resources to check whether a contractor or lessor has provided acceptable documentation to show compliance for many of the commonly used sustainable requirements (e.g. WaterSense, EPEAT, Green Seal, SNAP).