The Four Process States: Specifications and Control Limits

Discover how to identify the state your product and process are in and how to effectively use control charts to monitor improvements. We are using the individuals control chart. This places the product and the process into four states: The Ideal State, the Threshold State, the Brink of Chaos State and the State of Chaos. These four states are formed by a process being in or out of control, and the product being in or out of specifications.
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[@sunitha2488]

When the prcoess is in control but does not meet specifications, which type of error is it?

[@SPCforExcel]

There is not a type of error. There are two different issues. In control is a state of the process, while specifications are something we put on the process.