In my November 2003 "3.4 per Million" column (p. 67), I described a traditional and a 30,000-foot-level procedure for creating control charts and making process capability/performance metric assessments for a continuous response. And in my November 2004 column (p. 85), I made a similar comparison for attribute data. In this column, I will extend the 30,000-foot-level control charting and process capability/ performance metric assessment to infrequent failure data. The 30,000-foot-level control chart is a Smarter Six Sigma Solutions approach that quantifies what the internal or external customer of a process is experiencing over time. It tracks the output of a process at a high level and is not intended to be used to determine if and when timely process input adjustments should be made.
展开▼
