User Testing: Why & How

There is no excuse for not performing usability studies, said Jacob Nielsen. They’re fast and cheap (e.g. testing with 5 users), and very convincing. Test with representative customers using realistic task, then be amazed by what you observe.
Here is a link to a nicely written article by Jacob Nielsen on “Why You Only Need to Test with 5 Users?”.
After watching the video, you can use the following usablity test plan as a reference to construct your own test plan: https://www.userfocus.co.uk/articles/usability_test_plan_dashboard.html.
Source: NNgroup (YouTube)