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conducted at the annual meeting of the American Educational Research Association, San Francisco, CA. Marx, R.W., Blumenfeld, P.C., Krajcik, J.S., Soloway, E., Cox, G., & Breen, T. (1995). PIViT: Technology for the professional development of science teachers. In E.S. Fletcher, Using technology to prepare effective and responsible educators. Symposium conducted at the annual meeting of the American Educational Research Association, San Francisco, CA. Zembal, C., Krajcik, J., & Blumenfeld, P. (1995). The role of cycles of planning, enactment and reflection in preservice teachers’ understanding of content selection and representation. Symposium conducted at the annual meeting of the American Educational Research Association, San Francisco, CA. Stratford, S., Jackson, S., Krajcik, J., & Soloway, E. (March, 1995). Model-It: A case study of learner- centered software for supporting model building. Paper presented at the Working Conference on Technology Applications in the Science Classroom, The National Center for Science Teaching and Learning, Columbus, OH. Krajcik, J.S., Ladewski, B.L., Crawford, B., & Hopkins, B. (1994). Fostering investigation and collaboration in science classrooms: Challenges and benefits. Panel presentation at the 42th National Science Teachers Association National Convention, April 30 - March 2, Anaheim, CA. Zembal, C.M., Krajcik, J.S., Blumenfeld, P.C., & Palincsar, A. Apprenticeship pre-service elementary teachers in developing a cognitive framework for science content representation and instruction. Paper presented at the Annual Meeting of the National Association for Research in Science Teaching, March 26 - 29, 1994, Anaheim, CA. Krajcik, J.S. (1995). Technological support for reform in teacher education. American Association of Colleges for Teacher Education Annual Meeting, Washington DC. Feb. 14, Invited paper. Magnusson, S., Krajcik, J.S., & Borko, H. (1994). Teaching complex subject matter in science: Insights from an analysis of pedagogical content knowledge. Paper presented at the Annual Meeting of the National Association for Research in Science Teaching, March 26 - 29, Anaheim, CA. Krajcik, J., Blumenfeld, P., Marx, R., & Soloway, E. (1993). Project-based instruction in science: Challenges for teachers. In Blumenfeld, P. Project-based Instruction: Challenges, Resolutions and Support. Symposium conducted at the Annual Meeting of the American Educational Research Association, April 12 -16, Atlanta, GA. Marx, R., Krajcik, J., Blumenfeld, P., & Soloway, E. (1993). The growth of wisdom: How teachers meet the challenges and how they change. In Blumenfeld, P. Project-based Instruction: Challenges, Resolutions and Support. Symposium conducted at the Annual Meeting of the American Educational Research Association, April 12 -16, Atlanta, GA. Soloway, E., Krajcik, J., Blumenfeld, P., & Marx, R. (1993). Technological support for implementing project-based instruction in science. In Blumenfeld, P. Project-based Instruction: Challenges, Resolutions and Support. Symposium conducted at the Annual Meeting of the American Educational Research Association, April 12 -16, Atlanta, GA. Ladewski, B., Krajcik, J., Connie, C. & Hopkins, B. (1993). Studying teacher change in a profession school environment. Paper presented at the Annual Meeting of the American Educational Research Association, April 12 -16, Atlanta, GA. Mills, K. M., Krajcik, J. & Marx, R. (1993). Change in teacher beliefs about learning and the nature of science. Paper presented at the Annual Meeting of the American Educational Research Association, April 12 -16, Atlanta, GA. Krajcik, J. S., Blumenfeld, P., Marx, R., Soloway, E., Blunk, M., Ellies, B., Kelly, B., Ladewski, B., & Mills, K. (1993). Case studies of project-based science instruction: Challenges of implementation. Symposium conducted at the Annual Meeting of the National Association for Research in Science Teaching, April 15-19, Atlanta, GA. Rubio, R and Krajcik, J. (1993). Influence of the use of telecommunications upon student motivation in a science classroom. Paper presented at the Annual Meeting of the National Association for Research in Science Teaching, April 15-19, Atlanta, GA.