The mean scores of the three groups in the pre-test is much lower than the mean scores of
the groups in the post-test. This was due to the distinctive characteristics of the concept maps generally. One is that
concept mapping is grounded in a sound cognitive learning theory, Ausubel’s Assimilation Theory (Ausubel, 1968;
Ausubel, Novak, &Hanesian, 1978) which posits that knowledge can be learned most effectively by relating it to
previously existing knowledge. Concept maps are viewed as a methodological tool of assimilation theory that
displays fundamental elements of the theory such as subsumption, interrogative reconciliation and progressive
differentiation.