Efficiency is the extent to which an evaluand produces outputs and outcomes without wastage of time, effort, money, space, or other resources. Efficiency alone is insufficient to determine merit or worth—an evaluand could be highly efficient but produce outcomes of insufficient value (e.g., too small an effect), or it could still be excessively costly even though it used as few resources as possible (i.e., it exceeded budgetary or time constraints, even in its most efficient form).

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