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Control Chart Control Limits

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Term Definition
Control Chart Control Limits

These are statistical reference points on a control chart defined as 3σ below the mean (the lower control limit or LCL) and 3σ above the mean (the upper control limt or UCL). Many people confuse these with the upper/lower specification limits (USL/LSL) which are defined by what the customer wants, while control  limits are defined by how the process performs.
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