Arguing that understanding what lies behind the apparent usability of direct manipulation style interfaces might not only help in building better interfaces, but can also draw attention to possible side effects, this paper uses examples from a prototype data manipulation system to pursue a characterization of direct manipulation interfaces as…

Considers demands on the reader of printed material displayed on the video screen. Ways that electronic media can engender and foster reading skills are discussed, including use of graphics in video displays and ways educationalists may contribute to development of videotext and software to teach reading. (40 references) (MBR)