Ishikawa diagram


Cause and effect diagram for defect XXX.svg
One of the Seven Basic Tools of Quality
First described by     Kaoru Ishikawa
Purpose     To break down (in successive layers of detail) root causes that potentially contribute to a particular effect

Ishikawa diagrams (also called fishbone diagrams or cause-and-effect diagrams) are diagrams that show the causes of a certain event. Common uses of the Ishikawa diagram are product design and quality defect prevention, to identify potential factors causing an overall effect. Each cause or reason for imperfection is a source of variation. Causes are usually grouped into major categories to identify these sources of variation. 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, computers, tools etc. required to accomplish the job
* Materials: Raw materials, parts, pens, paper, etc. used to produce the final product
* Measurements: Data generated from the process that are used to evaluate its quality
* Environment: The conditions, such as location, time, temperature, and culture in which the process operates

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