Research in chemistry education has revealed that students going through their undergraduate and graduate studies in organic chemistry have a fragmented conceptual knowledge of the subject. Rote memorization, rule-based reasoning, and heuristic strategies seem to strongly influence students' performances. There appears to be a gap between what we…

In a recent issue of "Science Education" (v.63: 395-406), Stewart criticized methods for assessment and representation of cognitive structure in minds of learners and attempts to link these structure to content structure in subject matter being learned. Presents counterarguments to Stewart's position. (Author/JN)

Describes how the study of established association patterns in the form of postulational-deductive systems can engender both learning and thinking. The authors used Darwin's theory of descent with modification to illustrate some parts of the above thesis. (HM)