CD-ROM - based distance learning
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Non-interactive
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Interaction with computer ? Interaction with instructor
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Without instructor, it leads to low completion rates
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Does not support student's group interactions
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No real-time student verification
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Difficult effectiveness assessment, hence not suitable for certificate courses
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Contents is expensive to develop
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CD-ROM technology is a good add-on to Web-based training, but it isn't very useful stand-alone for DL applications
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