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Aucb.122 fa.editor-p utzoo!decvax!ucbvax!C70:editor-p Mon Dec 7 18:51:46 1981 Re: Cross-Product Languages >From Moran@PARC-MAXC Mon Dec 7 18:47:48 1981 As a first-order approximation, meta-control-d is THREE keystrokes, ie, each keypress is counts as a keystroke, a la the Keystroke-Level Model (CACM, 1980). I believe this simple additive model is approximately right. While the ESC is "conveniently located", it is outside of the touch typing region (for most people) and so takes longer to reach. I guess I believe that the above example is less than three keystrokes according to a more sophisticated model, but not much less. We have not run any experiments on these special shift-key combinations; and I'm not interested in doing so, since I think the effects really are second-order. You might try applying the Rumelhart/Norman typing model to see if the effects are more substantial.

Tom Moran

[ Tom should know. He's one of the few people around who is actually doing research in this area! I have asked Dave Rumelhart for his opinion, and will publish it here if he has any interesting observations. JQJ ]

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