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[xmca] leading activity related question

Thanks for the paper, Mike.  You made the point that educators conflated zopeds with scaffolding back then in 1984 and I still see that happening today.

But more importantly, you use the phrase "activity structures" rather than "activity systems" in the section on work activity.  I know how YE defines the latter an your use of "structures" indicates a difference, perhaps like how Lemke defined activity structures in his early work -- would you comment on your view of the contrast between structures and systems?

William Barowy, Ph. D. 
Associate Professor,
Lesley University 
29 Everett Street, 
Cambridge, MA 02138-2790 
"I am always doing that which I cannot do, in order that I may learn how to do it."
--Pablo Picasso

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