Discusses a dimensional scale for the evaluation of the multimedia user interface. Reports on a study of the use of the scale by novice graduate students at the University of Houston Clear Lake. Discusses hypermedia as a subset of multimedia, and investigates dependent measures including navigation. (LRW)

This paper promotes further discussion and analysis of interactivity in learning environments and contains a classification of interaction types appropriate for consideration in multimedia settings. Through an examination of related factors associated with navigation and control, a matrix of interactive dimensions is proposed. (Author)