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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