Sinclair Associates
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Statistical Control and Response

Statistical methods promote the proper use of data in day-to-day process management decisions and actions. When analyzed and interpreted correctly, data collected from the process can signal when changes or disturbances are occurring and trigger appropriate responses. Response to a process signal is a two-loop system. The "Blue Loop" is the immediate response or countermeasure that restores the process to its proper operating condition. The "Black Loop" is the root cause analysis loop that leads to actions that prevent the conditions and actions that cause process disturbances. For day-to-day process control to be effective, both the blue loop and the black loop are required. One cannot function effectively without the other.
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