Creating websites and in web-application that satisfies your users and customizers is always a challenging, but indeed it is extremely important. Unsatisfied users will leave and maybe never come back, which is obviously bad for your business. The avoid the risk of leaving customers website owners should evaluate their website in regards of user satisfaction and usability – you should ensure that users can do with your service what they intend to do.
On the market there are still a number of solutions to test websites, even by involving the users. The most often used approach is the use of questionnaires, which allows your users to give a feedback how they like your websites and maybe what can be improved. This test form is simple and easy to implement, however, you cannot identify where users might get problems on your website. The other form is making a user study, which is expensive and very complex and you have to invite users to laboratory etc. where you can observe what the user is doing.