User-centred design & development of an applied Web-based ITS

We describe how a user-centred engineering cycle is employed during the development of a Web-based instructional system for first year science and engineering students learning mathematics. After an overview of the relevant methodology and appropriate theory that influences the system´s design, we briefly present the system together with the steps that led to its integration in the teaching environment as well as to reusable materials and components for other environments.