Dale's Cone of Experience has progressed through a number of transitions and has had a significant impact on how instructional materials are designed for learners. A cursory examination of "Dale's Cone of Experience" on Google reveals thousands of citations. Hundreds of these are from educational institutions, corporations, training institutions, religious organizations, etc,. which have combined Dale's Cone with percentages indicating how much students will learn when interacting with materials designed according to the prescribed guidelines. However, current research indicates that these guidelines are invalid and ethically misleading.
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