In reply to your question, here is something both short and long. On my hard drive I've found an article by Engestrom that seems to go in the right direction -- I actually dislike doing this because its really not a very cohesive and personal response to you, but on the other hand the article seems highly relevant and, having upgraded my workstation OS to fedora core 5, getting it to talk correctly to an exchange server is taking up unplanned time.
Yrjo's work on tensions in multiple systems of activity is in his Learning by Expanding, located somewhere on the MCA/lchc web site. Several years ago I did a study which used his approach of historical analysis of multiple systems, recognizing tensions in and between them to look at the simaltaneous development of a person and her contexts. Peter Smagorinsky has a good article on a student becoming a teacher, which uses chat, but not, as I recall, with multiple systems. Peter's or Yrjo's article might be a good place to extend discussion of the issues I think you raise in your paper, although neither has the same focus on language that your paper has. But then Gordon Wells has a couple articles on activity systems and language, which might bridge the gap.
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