One point from Stian’s post got me thinking as I was reading the article: He suggested an important part of the ZPD scaffolding notion was that after a learner has learned the scaffolds and their affordances, the training wheels become unnecessary. Stian also mentioned how this training wheels metaphor was not operative in Knowledge Forum, where scaffolds are a constant tool for linking posts together. I think the building model is indeed more appropriate for Knowledge forum, where nodes must be logically connected. KF has chosen to use a limited (controlled) vocabulary for connections so that something coherent can result, whereas the original scaffolding idea may be more appropriate for integrating into a community of practice where all members are expected to gain fluency in the shared vocabulary.
Got to go now, see you at the meeting. Will develop these thoughts later.