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30,000-Foot-Level Performance Metric Reporting

Summary: Statistical control charts are typically used to identify in a timely fashion, as a control mechanism, special cause conditions at a low level, or a 50-foot level. In contrast, the 30,000-foot-level approach uses infrequent subgrouping or sampling to capture from a high level how a process is performing relative to overall customer needs. A sampling frequency that is long enough to span all short-term process noise inputs — such as between-day differences from raw material lots and personnel or machine differences — provides a high-level perspective that is often predictive. With this process-tracking and reporting approach, when an expected future performance statement for a process is undesirable, the improvement metric is "pulling" for a process improvement effort to change either the process's steps or its inputs so the process output transitions to an enhanced level of performance. This article discusses possible methods for the 30,000-foot-level approach.

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  • Topics: Sampling, Statistics
  • Keywords: Control charts, Statistical quality control (SQC), Process capability (Cp), Process capability analysis, Process improvement, Sampling, Sampling interval
  • Author: Breyfogle, Forrest W., III;
  • Journal: Six Sigma Forum Magazine