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any time, any place
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instant feedback
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multiple attempts (best is recorded, never to be lost)
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control
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text independent
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documentation (WK home site)
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practice* features
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mathematical display formats, preview
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individualized variations on problems
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answer-checking formats
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expandability -- other courses & departments
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data collection for assessment
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summary
overview
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Unix or Linux
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visual esthetics
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entry challenges
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local administration
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learning curve
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