7 Tools of QC

Presents complex or abstract statistical information in a simple, visual format. The seven quality tools help monitor and control production processes, analyze and solve problems, generate ideas, and help make improvements. The seven tools include:

  1. cause-and-effect diagram (or ishikawa or fishbone): Identifies many possible causes for an effect or problem and sorts ideas into useful categories.
  2. check sheet: A structured, prepared form for collecting and analyzing data; a generic tool that can be adapted for a wide variety of purposes.
  3. control chart: A type of run chart used to study whether a process is predictable / capable and how it changes over time.
  4. histogram: The most commonly used bar graph for showing frequency distributions, or how often each different value in a set of data occurs; looks at the range of variation in a process.
  5. Pareto chart: Shows on a bar graph which factors are more significant.
  6. scatter diagram: Graphs pairs of numerical data, one variable on each axis, to look for a relationship.
  7. run chart: Shows process data trends over time.
  8. flowchart: Visually displays the steps of a process and how the people interact within it.
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