Fishbone diagram definition
/What is a Fishbone Diagram?
A fishbone diagram is a visual layout of the possible causes of a problem. It is quite useful for classifying a full range of causes, which can then be used to arrive at solutions. The diagram is structured to show a number of branches, and so looks somewhat like a fish skeleton (hence its name). A fishbone diagram begins with a single line, at the end of which is stated the problem to be solved. Then a number of branches are added that denote the general areas in which the causes of problems may be found. The generic headings most commonly used for these problem areas are methods (procedures), machines (equipment), people, materials, measurement, and environment.
With this basic structure in place, a facilitator then collects possible causes from the team assigned to the problem, and writes them into the diagram. The outcome is a diagram similar to the following sample. This approach does a good job of organizing information about the causes of a problem, and is a commonly-used tool for the enhancement of quality.
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Disadvantages of a Fishbone Diagram
A potential problem with the layout of a fishbone diagram is that it limits the number of causes that can be listed. When dealing with a complex problem, this means that the diagram could become excessively cluttered. Another concern is that any interrelationships between the various causes listed on it are not easily discernible. Thus, it works better for clarifying moderately simple problem areas.