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Originally developed by Professor Kaoru Ishikawa, this is a tool which helps to identify possible causes of a given problem. It is also called “fishbone diagram”.
This graphical tool in a diagram form will help in the analysis of a given problem. Very visual, it underlines the structure of all causes of the problem raised generally during a team brainstorming. The method is ideally organized over a number of meetings, enabling the team to become deeply immersed in the problem. Fresh suggestions regarding possible causes can arise during the break and members are more likely to forget who originated every idea, thus making subsequent discussions less inhibited.
The procedure is as follows:
- Draw a long horizontal arrow pointing to the right, and label it with the issue to be explained. This is the ‘backbone’ of the ‘fish’. [Black Line]
- Draw arrows coming heading to the ‘backbone’ with 45 degrees angle, one for each cause of the problem that you have identified and label then at non arrowed end. [Big Orange Lines]
- Each arrow should have smallest arrows representing subsidiary causes for each main cause [Small Orange Lines]
- Analysis
This diagram will help to point out with causes to work on to solve the problem.
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Spec Sheets 
