Efficiency

Ability to accomplish a task with minimal waste.

effectiveness

Efficiency refers to the ability to accomplish a task or achieve a desired outcome with minimal waste of time, energy, materials, or other resources.

/ɪˈfɪʃənsi/

From Middle English efficiens, from Old French eficient, from Latin efficientem (present participle of efficere 'to make effective'.

Efficiency means doing things well, using as little time and resources as possible, like getting to school quickly by taking the best route.

effectiveness productivity

inefficiency wastefulness

performance productivity

economy optimization

conceptual functional