When a researcher analyses a specific lesson, he usually has the intention of analysis in advance. In this case, he can, in principle, collect any kind of information necessary for the analysis. However, there sometimes arise cases in which he feels the necessity to analyse a particular lesson after it was over. The usual methods for analysing a lesson cannot be applied to these cases. Therefore, it is necessary to develop different kinds of methods for analysis which are applicable to the above cases. This study aims at developing a method for categorizing the teaching style of a teacher in a series of science lessons. In order to categorize teaching styles of three teachers in three 5th-grader science classes on the unit "seed germination", content analysis of the notes found in all the pupils' notebooks was attempted. The results indicate that the pattern of the frequency distribution of the notes classified into each of "eight kinds of teaching processes of science lessons", to be defined in this study, is an index of categorizing the teaching style in the series of science lessons concerned.
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