Lean Definition

Ishikawa or Fishbone Diagrams

Ishikawa or Fishbone Diagrams are diagrams that show the causes of a certain event- created by Karou Ishikawa (1990). Common uses of the Ishikawa diagram are product design and quality prevention, to identify potential factors causing an overall effect. Each cause or reason for imperfection is a source of variation. Causes are grouped into major categories to identify these sources of variations. The categories typically include:

  • People – Anyone involved with the process
  • Methods– How the process is performed and the specific requirements for doing it, such as policies, procedures, rules, regulations and laws
  • Machines – Any equipment, computer, tolls etc required to accomplish the job.
  • Materials– Raw materials, parts, pens, paper, etc. used t produce the final product Measurements: Data generated from the process that is used to evaluate its quality
  • Environment – THE conditions, such as location, time, temperature, and culture in which the process operates.

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