3. Cognitive Desiderata for Future Interfaces Exploit human spatial perceptual-motor abilities. Major human capability - action system is “second brain.” Prime benefit of original GUIs, but largely swamped by featuritis. Use auditory/speech channel as parallel to visual/manual. Grossly underutilized - maybe reserved for human-human channel? But beware conflict with verbal working memory. Use modeling techniques to re-simplify the interface procedures. Quantitative metrics for procedural knowledge amount and overlap. No excuse for overly complicated user procedures. Support task memory appropriate to the skill level. Skilled performers have extremely powerful working memories. Better mapping of domain semantics to/from the interface. Enable knowledge-based inference of interaction procedures.