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More than happy to accept Wil's addition to my suggested "methods of education."  He's right.  One needs more than diversity and co-constructive dialogue, one needs a "problem" to give direction to the conversation.  And, for that matter, to create a context within which one can adjudicate among various suggested "understandings."  Important point.  Thanks, Wil. 

One suggested modification of Wil's modification: "... that give INDIVIDUAL AND commmon purpose ..."  The key here is that it would be nice if everyone shared a common purpose but it is enough (and minimally necessary) if everyone sees SOME purpose whether or not those are "common."  Ditto re the product: everyone needs to feel they achieved new understandings for themselves.  So much the better if there is a sense of new common understanding.