Theoretical models and approaches

In this lecture we examine the interaction style, which evolved from Command based interfaces to graphical user interfaces, then to WWW hypertext type interfaces and finally arrived at the level of virtual reality modeling level events. Then methodological approaches are presented with specific examples of situations and devices with obvious features of ergonomic design. Finaly the hierarchical task analysis is presented and there is a small introduction to the theory of Cognitive Psychology and its association with human processing model.