Validate user experience for expert users

1. What are the four 4 principles of usability testing?
2. Which of the testing type is related to user experience and ease of users?
3. Why are there 5 users for usability testing?

What are the four 4 principles of usability testing?

1) Determine whether testers can complete tasks successfully and independently. 2) Assess their performance and mental state as they try to complete tasks, to see how well your design works. 3) See how much users enjoy using it. 4) Identify problems and their severity.

Which of the testing type is related to user experience and ease of users?

Usability testing is a method of testing the functionality of a website, app, or other digital product by observing real users as they attempt to complete tasks on it. The users are usually observed by researchers working for a business.

Why are there 5 users for usability testing?

What's so magical about the number 5? Given that the probability of a user encountering an error during testing is 31%, according to Jeff Sauro of MeasuringU, testing just 5 users would turn up 85% of the problems in an interface.