Question

Properly completing a task while using the minimum amount of time and effort

Answer 1

Efficiency is an attribute of usability that focuses on completing a task using the minimum amount of time and effort.

Effective is an attribute of usability that focuses on properly completing a task by guiding users to perform all parts of a task.

With these definitions, it is safe to say that EFFECTIVE AND EFFICIENCY are the attributes of usability focusing on properly completing a task while using the minimum amount of time and effort.

Answer 2

It is called efficiency