What is an example of usability testing?
If for example, a washing machine brand wanted to test the usability of its product, then it would have to test it on a potential customer. To understand whether or not the machine is usable, the company should pick a potential customer and give her a precise task.
What is the purpose of a usability test plan?
One of the first steps in each round of usability testing is to develop a plan for the test. The purpose of the plan is to document what you are going to do, how you are going to conduct the test, what metrics you are going to capture, number of participants you are going to test, and what scenarios you will use.