Vol. 11, No. 2

February 2009

PQ Systems

Program manages complex email alerts

Quality Quiz: With a video!

Data in everyday life

Six Sigma

Bytes and pieces

FYI: Current releases


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Quality Quiz from Professor Cleary

"B" is correct.

Click here for a more complete video explanation

It would be premature to change control limits on any process until the following steps have been taken:

  1. Determine the assignable cause for the seven range values below R-bar. This process might take days, weeks, or months, since it involves problem solving by both you and your colleagues. Once you have determined the assignable cause, go to step #2.
  2. Once the cause for improvement has been determined, it must be standardized or institutionalized. If the improvement is caused by a change in suppliers, from Lucy Goosey Rung Company to Veritas Verified Vendors, for example, the purchasing agent should be instructed to purchase only from Veritas.
  3. Observe the process over a period of time in order to assure that the process variability has indeed been reduced, as the chart suggests.
  4. Now, only after completing these three steps, is it appropriate to adjust control limits.


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