![]() The defect, or the problem to be solved, is shown as the fish's head, facing to the right, with the causes extending to the left as fishbones the ribs branch off the backbone for major causes, with sub-branches for root-causes, to as many levels as required. Overview Sample Ishikawa diagram shows the causes contributing to problem. Causes are usually grouped into major categories to identify and classify these sources of variation. Each cause or reason for imperfection is a source of variation. Ĭommon uses of the Ishikawa diagram are product design and quality defect prevention to identify potential factors causing an overall effect. Ishikawa diagrams (also called fishbone diagrams, herringbone diagrams, cause-and-effect diagrams) are causal diagrams created by Kaoru Ishikawa that show the potential causes of a specific event. ![]() To break down (in successive layers of detail) root causes that potentially contribute to a particular effect
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