Talk:Community of practice

I am trying to make sense of all of this. Wenger talks of a social learning system and communities of practice being a part of them.

Riel and Polin talk of learning communities, distinguishing 3 types, practice-based communities (= Wenger's CoP, no?), task-based communities, and knowledge/building communities. (haven't read the details from the real source)

Arias and Fischer talk of communities of interest, where 2 CoPs come together to solve a problem of interest to both. (sounds like a task-based community, to me.

I am trying to find a way to organize all this. So far it all seems to be branching out from the Community of practice page, but I think this all falls under 'learning communities' or some such heading.

Any thoughts out there?