Source: http://www.teachthought.com/learning/20-collaborative-learning-tips-and-strategies/
Source: http://www.wcer.wisc.edu/archive/cl1/CL/doingcl/groups.htm
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Source: Students' Guide to Groupwork, U. of South Wales. https://student.unsw.edu.au/groupwork
Source: Solve a Teaching Problem, Eberly Center, Carnegie Mellon U. https://www.cmu.edu/teaching/solveproblem/strat-groupwork/