Hi Peter - You may be thinking of Marx Wartofsky's, primary,
secondary and tertiary artifacts? Primary (those used for
production), secondary (those used for remembering and transmitting),
tertiary (those used for imagining). If that sounds close-ish, I
think his discussion is in a 1973 pub called Models.
Cheers! Jen
>A question to help me get through a memory lapse: I recently read
>(and can't remember where) something in which the writer identified
>3 types of tools from a CHAT perspective: material, psychological,
>and ??? Any help here? thanks,Peter
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