This report presents a case study of an iterative process for creating an online educational system will be presented. The purpose of this case study was to build a functional website to make it easier and more fun for pupils to learn their homework. A cooperative evaluation technique was used to make sure that the website was user friendly. By running usability tests with real users, the designer wanted to find usability issues and flaws in the design. To find suitable users for the tests, a main persona was created. This main persona was supposed to represent the main target group that was predicted to use the website. By discussing the main persona with other system developers, teachers and pupils, the website was predicted to be used mainly by pupils being 10 to 16 years old, using the website in school as well as home. With the main persona in mind, 5 pupils were selected to participate in the cooperative evaluation process. The results from this evaluation have been analyzed, and suggested changes have been presented.