Concerning Piaget and the social, you might take a look at "Piaget's Social
Theory" by DeVries, in teh March 1997 _Educational Researcher_.
Diane (and others)
You might want to take a look at "Piaget's Socail Theory" in the March1997
_Educational Researcher_. DeVries makes the point that for Piaget, cognitive
operations and social co-operations are identical. The article is based mostly
on Piaget's _Sociological Studies_ just recently translated into English.
Hope this helps.
Betsy Zan