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This research bases a classification on the Four Categories of Scientific Literacy set down by Garcia(1985) and makes lots of reference to a guide book, "Procedures for Conducting Content Analysis of Science Textbooks", edited by Chiappetta, Fillman, and Settna(1991). In order to examine the analyst reliability, there is a content analysis for pilot study in advance, and as a result, the reliability coefficient is so high that it supports the possibility that the researcher can do the content analysis of biology textbooks by himself. The current biology textbooks for high school in Mainland China are taken as the target of the research, "paragraph" as the unit of analysis.It takes a census way; that is, carry out content analysis and comprehensive statistics from one textbook to another. The major purposes are : First, to investigate the amount and the rate of each textbook in the four categories of scientific literacy---Ⅰ.Science as a body of knowledge, Ⅱ.Science as a way of investigation, Ⅲ.Science as a way of thinking, Ⅳ.Interaction among science, technology and society (STS); Second, to make a comparison in the content distribution between the textbooks of the same type in the Mainland China and in the U.S.A.; Third, to Pre-evaluate the total amount and the relative rate in scientific literacy of each possible textbook combination which students may choose while taking biology courses from junior to senior high school, after the Mainland China abandoned the policy of the uniformity in textbooks The result of analysizing 12 sets of textbooks shows that all of the textbooks'''' relative rates in the four categories of scientific literacy are Ⅰ>Ⅱ>Ⅲ>Ⅳ; besides, all the rates in category Ⅰ are the highest rate over 0.5 and in the category Ⅳ are the poor standard less than 0.1. That explains that in content edition this kind of textbooks far more emphasize " Science as a body of knowledge" than the scientific literacy related with STS. Though the result is similar to the report of the same-type analysis on textbooks for American high school by some scholars, the report shows a quite low rate in category Ⅲ. It is worth considering whether the textbooks for American high school neglect "Science as a way of thinking." If the textbooks, the target of this research, can be chosen at will and can not be repeated, then after the Mainland China opened it policy of the textbook uniformity, there will be 12 different ways of combination. In content distribution of scientific literacy, there are large differences among the total amount and rate in each combination. Teachers can choose a best one by the practical need; in addition, this research provides an important reference for the biology teachers on both sides for editing textbooks.
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