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Home » Authors » Paul Keller

Paul Keller

Paul Keller is president of Quality America, a publisher of software and training for Six Sigma Quality Improvement. He has written several books, including SPC Demystified (McGraw Hill, 2011) and the third, fourth and fifth editions of The Six Sigma Handbook (McGraw Hill, 2009, 2013, 2018). For more information, email pkeller@qualityamerica.com or visit www.qualityamerica.com.

Articles

ARTICLES

people in ppe looking at a laptop in an industrial setting

Control Chart Analysis

An example.
Paul Keller
February 8, 2021
12 Comments

An SPC (Statistical Process Control) Software customer recently inquired if I could discern any issues in a process, as their customer had identified problems with three recent shipments. They provided data for the customer’s current year shipments for a variety of KPI (key process indicators) in an Excel file. 


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Repeatability Chart

An R&R Study

In most situations, you're likely to be surprised by the amount of R&R error detected.
Paul Keller
June 30, 2020
15 Comments

For most processes, we have a choice of measurement options that vary with cost. Ideally, we seek the most accurate measurement at the lowest cost with the expectation that the result will be satisfactory. When measurements are critical to operations, we should validate these assumptions.


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Quality cost chart

Prevention is the Key to Reduced Quality Costs

Customer-facing processes must be designed to prevent errors and minimize cost of failure.
Paul Keller
November 8, 2019
4 Comments

Quality professionals see many costs of quality firsthand. These include our salaries and benefits, the equipment used to measure and analyze quality outcomes, and the waste generated by these processes when they fail to meet requirements.


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SPC Software

How to Statistically Control the Process

When disruptions are detected, it’s critical that operators have the tools available to quickly diagnose and correct the issues.
Paul Keller
April 1, 2019
One Comment

Statistical process control (SPC) charts are used in quality-focused facilities to monitor process output on a continual basis and alert process operators, managers and the support staff in real-time when the process is shifting towards an undesirable condition.


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Figure 1. Figures from SPC IV Excel by Quality America. Used by permission

Gage R&R

Time to improve your process capability?
Paul Keller
July 1, 2017
One Comment

Spending too much (time or money) on part disposition? Start with an analysis of your measurement system. Even a marginal measurement system could contribute up to 30% of the variation seen in your control chart.


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Quality Software & Analysis: Is Your Process Performing?

Paul Keller
June 27, 2011
No Comments
Discover the most common SPC errors and learn how to correct them.
Read More
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