therbligs

therbligs

a coding system which breaks down the elements of a JOB into a number of discrete tasks. For example, therbligs could include ‘search’ (attempting to find an item manually or visually), ‘grasp’ (gaining control of an item by touch or grasping), ‘position’ (aligning an item for purposes of assembly) etc. By analysing a work task in this way, it may be possible to find ways of improving the methods used to do the job. See METHOD STUDY.
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In production management field, the methods of motion analysis include therbligs, MTM (methods-time measurement) [32], MOST (Maynard operation sequence technique) [33], and MODAPTS (The modular arrangement of predetermined time standards).
A Novel Method for Acquiring Engineering-Oriented Operational Empirical Knowledge
The well-established micro-motion studies' methodology, originated in twentieth century, emphasizes on: (1) a top-down segmentation of a primary task into basic motion elements ('Therbligs'); (2) recording of elements and key subtask performance in process-charts; and (3) obtaining metrics of performance for skill evaluation.
Apart from considering representative manipulation exercises from da Vinci surgical (SKILLS) simulator, real surgical videos were also analyzed with a list of predefined 'Therbligs' in order to validate the clinical relevance of this method.
Surgical performance assessment
Task analysis has its roots in the work of Gilbreth and Gilbreth (1921), who recorded elementary operations called therbligs. A related development from this early work is the representation of tasks in network models for purposes such as estimating the completion time of the task and determining the allocation of resources (e.g., Elmaghraby, 1977; Modor & Phillips, 1970; Pritsker, 1979; Wiest & Levy, 1977).
Steps toward building mathematical and computer models from cognitive task analyses. (Special Section)
These units were known collectively as "therbligs"--Gilbreth spelled backwards, with the `th' transposed.
Frank and Lillian Gilbreth: motion study pioneers

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