4.1.2—Efficiency and sustainability

Efficiency compares useful output with inputs used. Sustainability asks whether operations meet present needs without damaging the resources or systems future activity depends on.

Reducing waste can lower cost and environmental impact, but a change that improves one measure may increase another. Define the output and time horizon before judging.

A factory that cuts energy per unit while maintaining quality improves operational efficiency; if it shifts pollution elsewhere, the sustainability claim needs wider evidence.

Efficiency is not the same as effectiveness, and a greener label does not prove a lower total impact.