Six Sigma DMAIC Process - Control Phase - What is a Process Control?
Process control helps maintain performance at a level that meets customer needs and supports ongoing improvement. Key elements of a process control system are:- Documentation of the process
- Develop process metrics
- Monitor the process based on the defined metrics
Control limit Vs Specification limit
Control Limits: Control limits are calculated from process performance and plotted on control charts to assess statistical stability. Revise them only for a valid reason, such as a verified change to the process.
Specification Limits: Specification limits define acceptable output, for example in customer requirements or a service-level agreement (SLA). They help identify nonconforming output and change when the applicable requirements change. Keep them distinct from control limits; if shown on a chart for context, they must not replace the statistical control limits.
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