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A well-known tool in the analysis of a workstation , the Spaghetti diagram allows to visualize simply the whole of the actions of a sequence of work.

The spaghetti diagram is a representation of the movement of staff in a working environment. Often complex, this representation ended up looking like a dish of spaghetti, hence its name. It will most often be used in addition to a VSM to provide a physical dimension to the schematic representation of VSM. It is also used when analyzing a project SMED or 5S (specifically in the set in order Step).

The interest of these diagrams lies in being able to quickly visualize the complexity of a workflow and to highlight the Muda of motion.


  1. Define the scope of the study: This can be a step in a process, a complete line, a product… We will draw up a physical plan in view of it, taking into account all the elements: machine, storage area…
  2. Observe: Follow the procedure of the operation and trace it on the plan. We will make sure that it happens ‘ as usual ‘. A camera can be used to facilitate the route.
  3. Measure: Calculate the distances the person travelled. You can use a pedometer to make the measurement easier. This will compare the results before and after the improvement project.

It should be noted that in practice, the ergonomists recommend that a person, during the 7hr of his work day, not travel more than 7, 5km.

This distance is carried out without particular stress: no load, no steps to climb… and this at normal speed is about 4km/hr.

In addition to the painfulness that these movements can represent, it is also MUDA.

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