He advocates eloquently the case for using photography. Arguably the learner interacts with the designer of the learning system and the system is seldom an 'information resource' but a 'learning model'. The learners' interactions are therefore limited by the designers' model of learning. Indeed it is the information content which is the real benefit of multimedia systems not interaction. The most prevalent multimedia systems follow an instructional model of education.
Cost also limits interactivity.
He concludes that hypermedia allows everything to be linked to everything just like human imagination. But teaching, as opposed to learning requires rather narrower perspectives. We need more radical reviews of what learning might be, combined with innovation in design to realize more fully the true potential for educational interaction in multimedia. The study is concerned with the emergence of a new technological medium and therefore prone, as it must be, to the problems of using such a medium. However, Jonathan Grove and Noel Williams skillfully outline their research and its relationship with other educational media.