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Abstract：Computers have been used in education for over 20 years. Computer-based training (CBT) and computer aided instruction (CAI) were the first such systems deployed as an attempt to teach using computers. In these kinds of systems, the instruction was not individualized to the learner's needs. Instead, the decisions about how to move a student through the material were script-like, such as ``if question 21 is answered correctly, proceed to question 54; otherwise go to question 32.'' The learner's abilities were not taken into account.
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