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One needs both asynchronous (self paced) and synchronous learning
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Asynchronous learning implies that a Web server supplies data from a multimedia Web Site or a backend database
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Synchronous learning implemented by sharing SOME but not all information (guided tour) from an asynchronous site and combining it with audio video conferencing, chat rooms, white boards etc.
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Must support unstructured modest size data sets ( a "few" pages from a single instructor) of disparate type and
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Large more uniform structured datasets such as collections of courses from a large institution.
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Web Site is unstructured and web-linked database is structured
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