OSD's Best Value Procurement Handbook sets forth the policy requirements and best practices established pursuant to the Commonwealth of Massachusetts’ procurement regulation, 801 CMR 21.00, Procurement of Commodities and Services, including Human and Social Services. This Handbook provides comprehensive guidance to Executive Departments on competitive procurement, purchasing, and contract management requirements for goods and services, including use of the COMMBUYS Market Center. COMMBUYS is the designated source for posting all jurisdictional bids, accepting electronic responses, awarding contracts and associated catalogs, documenting procurement exceptions, and issuing requisitions and purchase orders. Collectively, the requirements outlined in this policy are designed to ensure an open, fair, and competitive procurement process, as well as an efficient and transparent purchasing process. The guidance in this document must be followed by all Executive Branch Departments. Some non-Executive Departments (collectively, Departments) have elected to follow 801 CMR 21.00 and are encouraged to follow this guidance, as well.