At 2:57 PM 5/19/95 +0100, Dave Wilson wrote: >>I recall, vaguely, some time ago that Nicholas(?) said that Sketchpad was >explicitly using the metaphors of object then tool, in that you first >select the object(s), and then the appropriate tool to have the desired >effect. >Cabri reverses this, tool then object, in that you select the tool and then >the objects you wish them to operate upon.
I've used Sketchpad for 4 or 5 years and have just played with Cabri in the last year or so. Cabri's "tool then object" (perhaps "action then object" or "operation then object") feels more intuitive to me. Realizing that made me remember how many times I've seen students go to a menu and the choice they want is greyed out because they've not first selected the object. I wonder what Sketchpad's rationale is for "object then tool."
Lynn Stallings Mathematics Education Department 105 Aderhold Hall The University of Georgia Athens, Georgia 30602-7124