In the book Lean Thinking, James Womack and Daniel Jones recount a story of stuffing newsletters into envelopes with the assistance of one of the author’s two young children. Every envelope had to be addressed, stamped, filled with a letter, and sealed. The daughters, age six and nine, knew how they should go about completing the project: “Daddy, first you should fold all of the newsletters. Then you should attach the seal. Then you should put on the stamps.” Their father wanted to do it the counterintuitive way: complete each envelope one at a time. They told him “that wouldn’t be efficient!” So he and his daughters each took half the envelopes and competed to see who would finish first.