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When Dad made a motion study, he broke down each operation into a Therblig, and then tried to reduce the time taken to perform each Therblig.

Every Therblig had its own symbol, and once they were painted on the wall Dad had us apply them to our household chores—bedmaking, dishwashing, sweeping, and dusting.

Actually, a Therblig is a unit of motion or thought.

Third comes "select,” the process of sliding the razor prior to the fourth Therblig, "grasp.”