For an excellent summary of the tenants of constructivism versus objectivism, together with ideas on applying constructivist models of learning, see:
Rose Marra and David Jonassen (1993). Whither constructivism. In D. Ely and B. Minor (Eds.), Educational media and technology yearbook, 1993. Englewood, CO: Libraries Unlimited, Inc.
The behaviorist-constructivist paradigms anchor ends of a materialist-idealist spectrum; hence, they fall prey to the problems of Cartesian (body-mind) dualism. While both materialists and idealists believe that sense-apprehended information reaches the mind, materialism assumes that, because of this information, the mind represents reality. Idealism asserts that, because of this information, the mind constructs reality. One way to reconcile the contradictory epistemologies is through structuralism, which holds that world knowledge does not enter the mind as raw, random data, but as pre-processed, abstracted structures. Structuralism has been applied to resolve scientific materialism-idealism conflicts. I have found no similar attempts to reconcile behaviorist-constructivist conflicts. Is any subscriber to ITForum aware of such an effort?