The OECD Development Co-operation Directorate (DAC) defines efficiency as follows: "Efficiency measures the outputs -- qualitative and quantitative -- in relation to the inputs. It is an economic term which signifies that the aid uses the least costly resources possible in order to achieve the desired results. This generally requires comparing alternative approaches to achieving the same outputs, to see whether the most efficient process has been adopted. When evaluating the efficiency of a programme or a project, it is useful to consider the following questions: Were activities cost-efficient? Were objectives achieved on time? Was the programme or project implemented in the most efficient way compared to alternatives?" (DAC criteria for evaluating development assistance)
