Peters, Holmberg and Moore
This is just a daring attempt to make a sweeping synthesis of the three main historical theories of Distance Education. Even if I think that Moore’s is more elaborate and more prone to give fruitful results, the fact is that all three contribute to a vision of the field. And the best way I found to show it, bearing in mind that I’m using a simple two dimensional scheme adapted for the aim at hand, forcefully omitting most of the details, sometimes what is simple shows best the point. And the point is that research always differs with the researcher, but the joint efforts of many researchers almost always drive us to better ways for reading the world. So, there is the modified fig. 4.1 that Amundsen proposed in Keegan’s book from 1993:
CAmundsen (1993). The evolution of theory in distance education. In: Theoretical Principles of Distance Education, DKeegan (ed.), Routledge, pp. 58-69 (note: the pages are from the e-book 2005 edition of the book and differ from the printed one).
PS: I have no idea where to put Wedemeyer in this scheme (no sources explored, still – tempus fugit), but I take comments, no problem!