For example, if you played sports, you probably played at least once for a team that looked great on paper, but on the field just never meshed – and fell far short of its potential. On the other hand, in college or on the job, you may have been assigned to a partner with whom you had nothing in common, whose personality was incompatible with yours, and with whom you shared no skills or experience . . . and yet the two of you proved to be surprisingly productive. How did that happen?