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The basic concept was first used in the 1920s, and is considered one of the seven basic tools of quality control. [5] It is known as a fishbone diagram because of its shape, similar to the side view of a fish skeleton. Mazda Motors famously used an Ishikawa diagram in the development of the Miata sports car. [6]
The seven basic tools of quality are a fixed set of visual exercises identified as being most helpful in troubleshooting issues related to quality. [1] They are called basic because they are suitable for people with little formal training in statistics and because they can be used to solve the vast majority of quality-related issues.
1982 saw the development of the Ishikawa diagram, which is used to determine the root causes of a problem. After Ishikawa died in 1989, Juran delivered this eulogy: [4] There is so much to be learned by studying how Dr. Ishikawa managed to accomplish so much during a single lifetime.
Many disciplines are typically involved in the "8Ds" methodology. The tools used can be found in textbooks and reference materials used by quality assurance professionals. For example, an "Is/Is Not" worksheet is a common tool employed at D2, and Ishikawa, or "fishbone," diagrams and "5-why analysis" are common tools employed at step D4.
Arrow diagram. This tool is used to plan the appropriate sequence or schedule for a set of tasks and related subtasks. It is used when subtasks must occur in parallel. The diagram helps in determining the critical path (longest sequence of tasks). The purpose is to help people sequentially define, organize, and manage a complex set of activities.
A fishbone diagram is a graphical means for finding possible problems in a chain of processes. By collecting the different data related to the problem, and inputting them into the diagram, it becomes easier to analyze the data in the order it is used, and hence determine the root of the problem. This is commonly used to find the bottleneck in a ...
Quantification of measurement uncertainty, including the accuracy, precision including repeatability and reproducibility, the stability and linearity of these quantities over time and across the intended range of use of the measurement process. Development of improvement plans, when needed.
[21] [22] There are normally a series of causes stemming from one root cause, [23] and they can be visualized using fishbone diagrams or tables. The five whys can be used as a foundational tool in personal improvement. [24] Masaaki Imai made the term famous in his book Kaizen: The Key to Japan's Competitive Success. [1]