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

  • Individuals and Moving Range chart (I-MR or ImR and X-MR or XmR)
  • Average and Range chart (X-bar and R)
  • Average and Standard Deviation chart (X-bar and S)
  • Estimated Weighted Moving Average (EWMA)
  • Cumulative Sum chart (CUSUM)

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