Cognitive research has shown that learners construct knowledge and that the knowledge they already possess affects their ability to learn new knowledge. If new knowledge conflicts with prior knowledge, then new knowledge will not make sense to the learner. This has implications for instruction. Because knowledge previously constructed by the learner will affect how she or he interprets what the instructor is attempting to teach, the instructor must evaluate whether students possess sufficient prior knowledge and whether this knowledge conflicts with what will be taught. To ignore learners' prior knowledge will most likely mean that the message intended by the teacher will not be the message understood by
the students.
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