Lean Manufacturing and Six Sigma Definitions

Glossary terms, history, people and definitions about Lean and Six Sigma

Control chart

Control chart is a type of time-based trend analysis tool used within Statistical Process Control.

It is also called a Process Behavior chart, renamed by Donald Wheeler in Understanding Variation, as he felt that “it is appropriate to use words that are more descriptive of what is intended.”

There are a few popular control charts:

Attribute data

  • Proportions chart (p chart)
  • Nonconforming chart (np chart)
  • Units nonconforming chart (u chart)
  • Subgroup nonconforming chart (c chart)

Variable data

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