ABSTRACT System development has become more and more concentrated on development for the Web and this has resulted in larger target groups. It will most surely continue to be so considering that the Web will be the infrastructure of business and services in the future. A big target group involves that the owner of a system can earn a lot of money from the paying users, but that assumes that the system can meet user needs. If a system on the Web does not satisfy the user?s demands then they will use the competitor?s system instead because it is only a mouse-click away. That is why the business, already during the development process, has to take the role of the users seriously. Even if all users cannot take part in the process at least some users can and it would be a shame not to take advantages of this kind of expert knowledge. This report describes how a system development project can be practised and how a developer can do to satisfy each user?s requirements even though he or she are not specified, and also why a useful system is classified as an investment in the future.