Efficiency KPIs measure how well resources are converted into outputs—typically cost, time, or effort per unit of output . “Cost per delivered order ($)” is a direct efficiency KPI because it expresses the resources spent to deliver one unit of service/output. “Production output (#)” is an output/volume measure, which is important but does not describe resource use per unit (it can increase even if efficiency worsens). “Employee satisfaction (%)” is an outcome/people metric, not efficiency. Selecting efficiency KPIs requires careful definition of included costs (labor, logistics, overhead allocation) and consistency across periods; otherwise, performance swings may reflect accounting changes rather than operational improvements. A common pitfall is optimizing efficiency at the expense of effectiveness (quality, customer outcomes). To prevent this, efficiency KPIs are often paired with effectiveness or quality KPIs (defect rate, on-time delivery, customer satisfaction) so teams don’t reduce costs by cutting corners. Proper KPI documentation and balanced scorecards keep efficiency improvement aligned with overall value delivery.