ABSTRACT. The key elements in Shulman's conception of pedagogical content knowledge are knowledge of representations of subject matter and understanding of students' learning difficulties. The present study deals with teachers' perceptions of areas of student difficulty related to their representations of difficult subject matter. The focus is the role of analogies in the representation repertoire of six experienced language teachers who were interviewed about aspects of subject-specific practical knowledge or pedagogical content knowledge: difficult topics in mother-tongue education, related learning problems, representations, use of analogies, need for appropriate analogies, and an instructional model. The main question addressed in this study is whether language teachers use forms of representation that are different from those used by science teachers, including analogies, because of the nature of their school subject. The results indicate that reading comprehension and writing proficiency are considered difficult topics, and there are various representations without analogies. In the teachers' view, there is no need for analogies and an instructional model. It appears possible that language teaching does not lend itself to the use of instructional analogies.KEY WORDS: academic discipline and school subject, analogies, difficult topics, knowledge base of teaching, mother-tongue teaching, pedagogical content knowledge
INTRODUCTIONExplaining difficult, new, or abstract subject matter to students often requires the use of special techniques, for instance, analogies. An analogy is the comparison of something familiar to something unfamiliar, in order to explain the unfamiliar concept. An analogy can help students transfer their existing knowledge to new knowledge. But analogies are also double-edged swords and can cause misconceptions. The analogy (a camera for the human eye or a computer for the brain) is a frequently applied tool within science education and has been intensively investigated as an aspect of science teachers' practical knowledge (Glynn, 1989;Treagust, Harrison & Venville, 1998). Whether this also applies to other school subjects is something we do not know much about. In our own research on language teaching (Hulshof & Verloop, 2002)