7 quality tools

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7 quality tools
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Methods and techniques

7 quality tools were created by quality practitioners over the years and collected in one group in early 50s in Japan. Along with the quality movement they were popularized as quality tools. Development of quality methods and techniques lead to creation of new set of quality tools, which extended the older one.

7 Traditional quality management tools

Traditional tools are called Magnificent seven. They are the most commonly used and they are of fundamental importance. These tools can be used on its own, but often are used as components of quality management methods. They are based on simple mathematics and statistics. Therefore, they are often called statistical process control tools. The tools include:

  • Fish diagram - cause and effects diagram used to find many levels of causes of analysed result
  • Check sheet - helps collecting data about quality in the process
  • Control chart - shows variability in the process and helps to analyse it.
  • Histogram - enables to show on chart the distribution of data. In controlled process it usually looks like Gauss curve (normal distribution)
  • Pareto chart - shows the most important elements of the group according to chosen criteria. It uses the 80-20 rule.
  • Scatter diagram - shows correlation between two variables
  • Flow chart - chart presenting flow of the process.

7 new quality management tools

Along with the development of quality management 7 new tools were created. They were designed to enhance traditional tools. They enable a better information flow in the enterprise. They are very important when solving problems.

They include: