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Evan Wittenberg, director of the Wharton Graduate Leadership Program, notes that team size is “not necessarily an issue people think about immediately, but it is important.” According to Wittenberg, while the research on optimal team numbers is “not conclusive, it does tend to fall into the five to 12 range, though some say five to nine is best, and the number six has come up a few times.” - knowledge.wharton.upenn.edu