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CMA Intermediate · Operations Management and Strategic Management · Control Measures - Time and Motion Study, Method Study, Work Study

In motion study, the basic elementary movements into which any manual operation can be broken down, such as 'Grasp', 'Transport Empty' and 'Release Load', were named by Frank and Lillian Gilbreth as:

The basic elementary movements in motion study, like grasp, transport empty and release load, are called therbligs. The term was coined by Frank and Lillian Gilbreth, who analysed manual work by breaking it into these fundamental units of hand and eye movement.

  1. ATherbligsCorrect
  2. BSiglas
  3. CKaizens
  4. DPareto units

Explanation

The Gilbreths identified a set of basic hand and eye movements and called them therbligs (Gilbreth spelt backwards, with the th transposed). Siglas are not a standard motion study term, kaizen refers to continuous improvement, and Pareto units are not a motion element.

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