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In the early 1900’s, Frank and Lillian Gilbreth refined a system of analyzing work to improve processes. They focused on identifying the core ‘motion cycles’ that combined to form work activities.

This detailed understanding of work let them identify inefficiencies and eliminate waste.

The name ‘Therblig’ comes from a reversal of the letters of their name, using the ‘th’ as a single letter.

The Therbligs are:

  • Search
  • Find
  • Inspect
  • Select
  • Grasp
  • Hold
  • Pre-Position
  • Position
  • Use
  • Assemble
  • Disassemble
  • Transport Loaded
  • Transport Empty
  • Release Load
  • Unavoidable Delay
  • Avoidable Delay
  • Plan
  • Rest

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