Control Chart

The Quality Toolbook > Control Chart

When to use it | How to understand it | Example | How to do it | Practical variations

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The Control Chart is used to identify dynamic and special causes of variation in a repeating process.

• When to use it: Situations when it is useful.
• How to understand it : Details of how it works.
• Examples : Some examples of usage.
• How to do it : Step-by-step instructions on using it, plus:
  • Choosing the type of Control Chart
  • Calculation for Average and Range Control Charts
  • Calculation for Individuals and Moving Range Control Charts
  • Calculation for Standard Deviation Control Charts
  • Calculation for Proportion Defective (p) Control Charts
  • Calculation for Number Defective (np) Control Charts
  • Calculation for Number of Defects (c) Control Charts
  • Calculation for Defects per Unit (u) Control Charts
• Practical variations : Variants and variation.

Notes

Control Charts were defined by Walter Shewart. Control limits are sometimes also called Action Limits, although this can also have a very different meaning (Control Limits are calculated; Action Limits may be assigned). Control Charts are one of the first seven tools.