Article by Jeremy Roschelle

This may be more interesting for me than for you, since I'm using CHAT (probably modified to include more of a sense of place), but maybe someone already has, and/or has read, this article and can tell me?

Activity Theory: A Foundation for Designing Learning Technology?
Jeremy Roschelle
Journal of the Learning Sciences, 1998, Vol. 7, No. 2, Pages 241-255
(doi: 10.1207/s15327809jls0702_5)