Are usability testing and usability evaluation the same thing? If not, what's the difference?

Usability testing is the concept of having a representative group of users perform typical actions on a product while observers and developers watch, listen, and take notes.

There are five metrics of usability: ease of learning, ease of remembering, fault tolerance, interaction efficiency, and user satisfaction.

Problems that usability testing is designed to solve:

1) Determine the level of usability of the product being tested

2) Compare the level of usability to the intended target, to competitors, and to older designs

3) Compare different scenarios to determine which one is more feasible

4) The usability problems of the product being tested

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