pbc is about buying performance, not transactional goods and services, through an integrated acquisition and logistics process delivering improved capability to a range of products and services. pbc is a support strategy that places primary emphasis on optimising system support to meet the needs of the user. pbcs delineate outcome performance goals, ensure that responsibilities are assigned, provide incentives for attaining these goals, and facilitate the overall life-cycle management of system reliability, supportability, and total ownership costs.