Right or wrong, congratulations on your boldness in attacking the world's leading expert on quality.  Too often people are afraid to speak up.  Only by stepping forward into open discussion, can quality progress.  Very much looking forward to Dr Wheeler's enlightening reply.  No matter who proves correct, we will all learn.

Interesting article.  I enjoy reading alternative viewpoints on this subject.

My interpretation of Wheeler's discussion of intraclass correlation and measurement systems differs.  I understood his argument as prioritizing process behavior charts over measurement system analyses.  He demonstrated that a poor - but stable - measurement system is still capable of detecting "signals of exceptional variation" provided the charts are constructed and interpreted properly.  Wheeler goes on to imply that the absence of process signals should prompt the investigation of the measurement system.

To me, the implicit point of Wheeler's discussion was that in the reality of limited time and money, one is better off charting the process measurement data to identify the "signals of exceptional variation" so they can be dealt with.  The process behavior charts are robust enough to overcome measurement error in the presence of exceptional variation.  Once the process is stable (homogeneous), a deeper investigation of the measurement system may be in order.