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Home » Authors » William D. Kappele

William D. Kappele

William D. Kappele is president of MathOptions Inc. (Bellingham, WA).
Articles

ARTICLES

Closeup of metal processing plant worker inspecting certain pieces of finished products using a manual caliper device.
Measurement

Blind Analysis: Concealing Results from the Analyst

William D. Kappele
August 31, 2025

People excel at hitting targets, often impairing objectivity when they assume results before experiments. To prevent this, we can use Blind Analysis.


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Figure 1: Measurement System Quality (ICC) vs. Attenuation.

The Cost of a Poor Measurement System

Convince people of the value of measurement system analysis.
William D. Kappele
July 1, 2017

Quality professionals know the value of good measurement systems. They know that without trustworthy, high quality data you cannot make good business decisions. Unfortunately, most business people and many engineers don’t understand this value.


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GR&R for Destructive Measurement Systems

William D. Kappele John Raffaldi
May 1, 2010
Gage repeatability and reproducibility (GR&R) studies provide information on measurement system performance by analyzing measurement error from various sources.
Read More

QUALITY SOFTWARE & ANALYSIS: Gage R&R Improves Quality and Profitability

William D. Kappele John Raffaldi
June 1, 2006

A gage repeatability and reproducibility study can determine if a measurement system is acceptable for the required measurement.


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