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(l) Program A is said to be more efficient than program B if, for a given cost, a chosen aggregated measure of its positive results (such as effectiveness or benefit) is greater than that for program B. (IIASA)

(2) A ratio scale measurement of a measure of performance to resources expended to obtain the level of performance. (Turoff)

Relationship between input and output, whereby either the largest possible output has to be achieved on the basis of a given input (maximisation principle) or the least possible input on the basis of a given output (minimization principle). (Hornung)
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