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Teaching for Conceptual ChangeStudents need to make sense of their world. Over an extended period of time they construct their own explanations for how and why things behave as they do. Long before they begin formal schooling, children have made meaning of their everyday experiences. One or two classroom activities are not going to change ideas that work for students. Even after what appears to be a well-taught lesson, students invariably hold on to the explanations they had already constructed before teaching began. Research has shown that all learners hold on to their ideas tenaciously, even in the face of overwhelming evidence. Teaching for conceptual change takes time. Students need to identify and articulate their ideas, to investigate the soundness and usefulness of their own ideas, and those of others, including scientists, and to reflect on and reconcile differences in those ideas. Many science programs assume that students are blank slates and that it is the teachers job to fill the empty places with information. Modern learning theorists directly contradict this. Even if they recognize the many advantages of incorporating new material into a students own context, most teachers do not take time to assess what their students have learned from prior experiences. If teachers do not assess and challenge a students theory, then the scientific theory or explanation will co-exist with the one already held by the student. This creates a confusing mass of fact and fiction. On their own students almost never use logical arguments or recognize the internal contradictions between their naive theories or ideas and those of experts. It is the teachers task to ensure that these are conscious experiences for the student. The challenge of teaching science is to ensure that students do not leave classrooms with their alternatative explanations intact or with new ideas and explanations that they do not understand. Students will more readily discard misconceptions that they have defended than those that they have not examined at all. Teachers should encourage students to look for inconsistencies between ideas they have and what their observations and exploration reveal to them. Some students will find this frustrating and will continue reasoning that justifies their old beliefs; for others, this experience will change their thinking. | ||||||||||||||||
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Education in Public Schools