Seven Basic Tools of Quality
The Seven Basic Tools of Quality is a designation given to a fixed set of graphical techniques identified as being most helpful in troubleshooting issues related toquality.[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.
The Seven Basic Tools of Quality includes :
Ishikawa (fishbone) diagram,
Check sheet,
Control chart,
Histogram,
Pareto chart,
Scatter diagram
Stratified sampling.
Origin of the designation
Original designation was just ″Seven tools″ and their content was formed during the fifties and sixties of the last century in Japan by K. Ishikawa and E. Deming.[3] The designation was inspired by the seven famous weapons of Benkei.[4]
At that time, companies that had set about training their workforces in statistical quality control found that the complexity of the subject intimidated the vast majority of their workers and scaled back training to focus primarily on simpler methods which suffice for most quality-related issues.
The Seven Basic Tools stand in contrast to more advanced statistical methods such as survey sampling, acceptance sampling, statistical hypothesis testing, design of experiments, multivariate analysis, and various methods developed in the field of operations research.
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