Excellent piece pulling together theories, making them understandable and relating them to current practice and people. Possibly only missing Lave's concept of peripheral participation and community of practice. I have always assumed an affinity between the idea of a journey from periphery to centre of a community of practice and that journey across a ZPD
We spend far too much time in education trying to pretend we can all get on whether hardened instrumentalists or dyed in the wool activity theorists, and it won't do.
we were all hoping that OpenID would end up being the sum of all (good) parts. Unfortunately, it became the opposite: an oddity not true to any of the visions, and far, very far, from being an aggregate of the best. Worse, its evolution has disintegrated into multiple incompatible architectures all of which have plenty of trees, but no forest. None of the original visionaries are actively involved in it any more, and it shows.