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Encyclopedia > Ishikawa diagram

The Ishikawa diagram is a graphical method for finding the most likely causes for an undesired effect. The method was first used by Kaoru Ishikawa is the 1960s. This is a list of graphical methods with a mathematical basis, by Wikipedia page. ... Kaoru Ishikawa (石川 馨 Ishikawa Kaoru) is a Japanese consultant, father of the scientific analysis of causes of problems in an industrial process. ... The 1960s, or The Sixties, in its most obvious sense refers to the decade between 1960 and 1969, but the expression has taken on a wider meaning over the past twenty years. ...

Because of its shape, it is also known as the fishbone diagram. Other names for this technique are: the cause-and-effect diagram or root cause analysis.

## How to make the diagram

Take a sheet of paper and draw a box on the right side of the paper. Draw a horizontal line from the left side of the box to the right. Write in the box the effect for which you want to find the causes. Starting from the horizontal line, draw four to six short diagonal lines in the direction the left upper and left lower corner of the paper. These are the main bones of the diagram. Label them with categories you know will span the whole problem space. For example, a business may use: management, manpower, machines and materials (the 4 M's).

Next, start filling the diagram with causes. Put them as arrows pointing to any of the main bones of the diagram. After you feel you have named most causes, identify the most likely causes for the effect in the box on the right side.

Results from FactBites:

 Ishikawa Diagram (805 words) Quality management: Ishikawa or Fishbone diagrams as a means to get the facts straight on the web-site for teachers and learners of English as a secondary language from a German point of view providing teaching and learning strategies as well as Total Quality Management and assessments in schools and seminars. The basic concept in the fishbone diagram is that the name of a basic problem is entered at the right of the diagram at the end of the main 'bone.' This is the problem of interest. A typical utilization is the drawing of a fishbone diagram on a flboard by a team leader who first asserts the main problem and asks for assistance from the group to determine the main causes which are subsequently drawn on the board as the main bones of the diagram.
 SAS/QC Software: Basic Problem Solving (423 words) The Ishikawa diagram, also referred to as a cause-and-effect diagram, tree diagram, or fishbone diagram, displays the factors that affect a particular quality characteristic, outcome, or problem. An Ishikawa diagram is typically the result of a brainstorming session in which members of a group offer ideas on how to improve a product, process, or service. The main goal is represented by the trunk of the diagram, and primary factors are represented as branches.
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