The fish bone diagram or Ishikawa diagram is a cause-and-effect diagram that helps to identify many possible causes for an problem and it can be used as a Investigation tool.
It can be used in case of any Deviation, Market Compliant, Out of specification to identify the possible root cause for the problem.
The diagram looks just like a fish’s skeleton with the problem at its head and the causes for the problem feeding into the spine. Once all the causes that underlie the problem have been identified, the investigator can start looking for solutions to ensure that the problem doesn’t become a recurring one.
Fish bone diagrams help us to determine the variables that may enter the equation. They allow us to make our plans so that we know how to deal with them in such a way that the quality of our final product is still up to standard and without significant variation.
Ishikawa diagrams were popularized in the 1960s by Kaoru Ishikawa , who pioneered quality management processes in the Kawasaki shipyards, and in the process became one of the founding fathers of modern management. In the 1920s it was seen as an important quality control tool.