Thanks to a question from one of the students in the Universidad Latina center, I am providing a few on-line resources that may be helpful in defining constructivism:
www.acjournal.org/holdings/vol5/iss3/special/jones.htm
carbon.cudenver.edu/~mryder/itc_data/constructivism.html
www.ericdigests.org/1999-3/theory.htm