Process Steps in Fishbone

nother way to use the fishbone diagram to search for potential Xs is to combine it with the SIPOC. During the construction of the SIPOC, the team lists between four and eight high-level process steps. Now, instead of using the standard bones (man, machine, material, methods, measurements and Mother Nature), the team uses the process steps listed in the SIPOC.

Fishbone with Process Steps

Figure 2: Fishbone with Process Steps

The list of questions remains the same:

  • “How does Process Step 1 negatively influence the defect?”
  • “How does Process Step 2 negatively influence the defect?”
  • And so forth.

Doing this has several benefits:

  1. The project team can identify and associate with the process steps more easily than with the generic bones.
  2. Due to this association, the team can normally think of more inputs than with the generic bones.
  3. After completing the fishbone with the process steps, it is really easy to pinpoint where the problem may be occurring.

By combining the cause-and-effect diagram and SIPOC, a Green Belt or Black Belt will quickly and more effectively find which critical Xs actually influence the project Y.



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