Concept maps their presentations on "energy" or "force" were prepared for two different first-year junior high school science textbooks. Comparisons were made regarding such characteristics as concepts, map structure (tree or loop), connections between concepts (strong, week or none), number of concepts classified (operational definitions, definitions by paraphrase, empirical relationship), numbers of strong, weak or neutral concepts, degree of abstraction, radius, peripheral points, degree of logic and so on. Results showed the following : (1) Nearly one-half of the total of 100 concepts found in each map were common to both maps. (2) The connectors used in each of the maps were both different and exclusive. These results show that, at least as far as the sections of "energy" in these two textbooks are concerned, textbooks tend to be highly original and, in particular, vary greatly in the degree of logic employed.
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