Examined the effects of different text typologies on older users' (age 57-67) performance in hypertext perusal. Compared two text typologies, hierarchical and referential, that were constructed with HTML, and discusses hypertext navigation problems with older users related to human spatial orientation. (Author/LRW)

Reviews relevant professional literature concerning hypermedia environments and adaptive instruction for online learning for distance education and continuing education. Highlights include aptitude-treatment interaction; cognitive processes; navigational paths; log files; and intelligent tutors. Contains 125 references. (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)