In most processes, the process control limits are set to correspond with the specification limits on the process.

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Process control limits are set based on the performance of the process, whereas specification limits are the allowable range for a particular characteristic or feature of the product or service being produced. Process control limits need to be within the specification limits, but they may not necessarily be set to correspond exactly with them. It is possible for a process to be within control limits but still produce products that fall outside of specification limits.

In Most Processes, the Process Control Limits Are Set to Correspond