... operations and maintenance ser-vices, custodial and janitorial services, groundskeeping and land-scaping services, and refuse and recycling services.Among facilities services, operations and maintenance ... 9manage the performance of these services, including (1) how buyersevaluate provider performance, (2) how buyers and providerscommunicate about expectations and levels of performance, and (3)how ... metrics,xiv Defining Needs and Managing Performance of Installation Support Contracts and contractual and informal incentives. As the Air Force expands itsuse of performance- based practices, we recommend...