Control Chart Types

How Many Types of Control Charts Are There?

There are two main categories of control charts:

  1. Variable control charts for measured data.
  2. Attribute control charts for counted data.

Within these two categories there are seven standard types of control charts. These are often refered to as Shewhart control charts because they were invented by Walter A. Shewhart who worked for Bell Labs in the 1920s.

seven types of control charts


Why are there so many types of control charts? What makes them different?

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Each control chart uses a different formula to account for three characteristics of the underlying data:

  1. The type of data (measured or counted)
  2. How measurements are grouped or what is counted
  3. The sample size

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QI Macros Draws All Seven of the Shewhart Control Charts

Shewhart Variable Control Charts

Use for Measured Data

(time, money, length, width, depth, weight, etc.)
Often contains decimals (.006, 8.9, 74.05)
Shewhart Attribute Control Charts

Use for Counted Data

(number of defects, mistakes, errors, etc.)
Always a whole number (1, 44, 75)

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QI Macros Draws These Specialized Control Charts Too


Learn More...


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