What is the Purpose of a Control Chart?

This is the third in a four-part series introducing control charts. The first blog addressed the question of what a control chart is. The second blog explored the relationship between variation and control charts . This blog begins to answer the following question:

What is the purpose of a control chart?

We will continue with the driving to work example shown in the last two blogs to explore three different purposes for a control chart....

common and special causes on a control chart

Variation and Control Charts

This is the second in a four-part series introducing control charts. The first blog addressed the question of what a control chart is . This blog will answer the following question:

What is variation and how does it relate to a control chart?

Understanding variation is the key to effectively using a control chart. A control chart provides a method for your process to communicate with you – to tell you if the process is doing what you designed it to do (only common causes of variation are...

What is a Control Chart?

This is the start of a four-part blog on control charts. The blogs will answer the following questions:

  • What is a control chart?
  • What is variation and how does it relate to a control chart?
  • What is a control chart used for?
  • Where is a control chart used?

Control charts are at the heart of statistical process control (SPC). So maybe we should start with answering what a process is. A process is simply what we do. It can be filling out an expense report, checking a person into a hospital, driving to work, filling a prescription, etc...

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