Some Principles in Tango Support of Distance Education I
One needs both asynchronous (self paced) and synchronous learning
Asynchronous learning implies that a Web server supplies data from a multimedia Web Site or a backend database
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.
Must support unstructured modest size data sets ( a "few" pages from a single instructor) of disparate type and
Large more uniform structured datasets such as collections of courses from a large institution.
Web Site is unstructured and web-linked database is structured