While the author acknowledges the difficulties inherent in generalizing from case studies, he has done a nice job of surveying strategies for increasing the cost effectiveness of different forms of online learning. Readers will appreciate the literature reviews outline the measurement of both cost and effectiveness. Showing clearly in the study's results is the dramatic impact of interaction on effectiveness. The report identifies a number of ways to reduce costs, including the redefinition of work functions and the coordination of learning support systems. Following the 50 page (PDF format) report are detailed descriptions of the case studies.
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