The fed. gov¿t. must seek to deliver results more efficiently. The prior Administration sought to improve efficiency under the Program Assessment Rating Tool (PART) by requiring programs to have at least one efficiency measure and procedures for improving efficiency, and show annual efficiency gains. This report examined: (1) the types of PART efficiency measures and the extent to which they included typical elements of an efficiency measure; (2) the extent to which selected programs showed gains and how they used efficiency measures for decision making; (3) the challenges selected programs faced in developing and using efficiency measures; and (4) other strategies that can be used to improve efficiency. Illustrations.