Resources expended in relation to the accuracy and completeness with which users achieve goals

Standard: ISO 9241-11:2018: Ergonomics of human-system interaction — Part 11: Usability: Definitions and concepts [ISO Standard]

The comparison of what is actually produced or performed with what can be achieved with the same consumption of resources (money, time, labor, etc.). It is an important factor in determination of productivity. See also effectiveness.

Website: BusinessDirectory, Online: http://www.businessdictionary.com/definition/efficiency.html, last visit 03.09.2019 [Business Dictionary]