Is your program easy to use? Generally, a program has good usability if it is easy for new users to learn, easy for them to use, and easy for them to remember when they use the program again. Usability is not the same as user experience (UX) but they are related. You may think that usability is difficult, but it only takes a little time and effort to make your program easier to use. In this talk, we will walk through how to do usability testing in open source software, and share actual usability test results from usability testing in GNOME. Attendees will learn how to easily set up and perform their own usability tests, to make their programs easier to use.