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Starr, M. L., Krajcik, J.S., & Blumenfeld, P. (1993). Content representation: A part of the science teaching of preservice elementary teachers. Paper presented at the Annual Meeting of the National Association for Research in Science Teaching, April 15-19, Atlanta, GA. Breen, T.J., Krajcik, J. S., & Coppola, B. (1993). The development of preservice teachers' content knowledge in an integrated teacher preparation program. Poster session at the Annual Meeting of the National Association for Research in Science Teaching, April 15-19, Atlanta, GA. Zembal, C., Starr, M., Krajcik, J., & Palincsar, A. (1993). Change in preservice teacher beliefs about elementary science teaching. Poster session at the Annual Meeting of the National Association for Research in Science Teaching, April 15-19, Atlanta, GA. Krajcik, J., Blumenfeld, P. & Soloway, S. (1992). Integrating the knowledge bases in science teacher preparation. Presentation at the Teacher Preparation and Enhancement Principal Investigator Meeting. May 29 - 31, 1992, Washington, D.C. Ladewski, B., Krajcik, J. S., Levy, J. S. and Hall, R. The development of elementary school students' ideas related to the categorization of living things. Paper presented at the 65th Annual Meeting of the National Association for Research in Science Teaching, March 21 - 25, 1992, Cambridge, MA. Nakhleh, M. B. & Krajcik, J. S. (1992). A protocol analysis of the effect of technology on students' actions, verbal commentary, and thought process during the performance of acid-base titrations. Paper presented at the 65th annual meeting of the national association for research in science Teaching, March 21 - 25, Cambridge, MA. Magnusson, S., Borko, H., Krajcik, J. S., & Layman, J. W. (1992). The relationship between teacher content and pedagogical content knowledge and student content knowledge of heat energy and temperature. Paper presented at the 65th annual meeting of the national association for research in science teaching, March 21 - 25, Cambridge, MA. Starr, M. & Krajcik, J. S. (1992). The use of concept maps in a physical science course for elementary preservice teachers. Presentation presented at the 40th National Science Teachers Association National Convention, March 26 - 28, Boston, MA. Krajcik, J. S. & Borko, H. (1991). Pedagogical content knowledge: an important construct for science education. In Pedagogical Content Knowledge: Definitions and Implications for Science Teacher Education and Research, Symposium. Paper presented at the 64th Annual Meeting of the National Association for Research in Science Teaching, April 7 - 10, Lake Geneva, WI. Krajcik, J. S. & Starr, M. (1991). The use of concept mapping in science education research: overview and issues, panel topic. Presentation presented at the 64th Annual Meeting of the National Association for Research in Science Teaching, April 7 - 10, Lake Geneva, WI. Templin, M. A. & Krajcik, J. S. (1991). A comparison of lesson planning decision patterns of novice and experienced biology teachers. Poster session at the 64th Annual Meeting of the National Association for Research in Science Teaching, April 7 - 10, Lake Geneva, WI. Krajcik, J. S., Layman, J., Starr, M. & Magnusson, S. (1991). A comparison of middle school teachers' content knowledge and pedagogical content knowledge of heat energy and temperature with their students' content knowledge. Paper presented at the 64th Annual Meeting of the National Association for Research in Science Teaching, April 7 - 10, Lake Geneva, WI. Nakhleh, M. B. & Krajcik, J. S. (1991). The effect of level of information as presented by different technologies on students' understanding of acid, base and ph concepts. Presentation at the 64th annual meeting of the National Association for Research in Science Teaching, April 7 - 10, Lake Geneva, WI. Krajcik, J. S., Layman, J. W., Starr, M. S. & Magnusson, S. (1991). The development of middle school teachers' content knowledge and pedagogical content knowledge of heat energy and temperature. Paper presented at the Annual Meeting of the American Educational Research Association, Chicago, IL. Krajcik, J. S. Less is more for conceptual learning. (1990). Presentation at the National Science Teachers Association, 38th National Convention, April 5-8, 1990, Atlanta, Georgia, invited presentation.