The CoWeb is a collaborative learning technology used in many classes (over 100) at Georgia Institute of Technology (Georgia Tech), USA. The authors present evidence of the success of the tool in supporting learning at a low cost. They also provide anecdotes about the active resistance they have received to use of the CoWeb in engineering, mathematics and some computer science classes. Evidence from interviews and questionnaires points to some of the sources for this resistance.
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Guzdial et al. (2002) studied this question.