Quality Check Blog

Quality Check is focused on best practices for real-time quality control in the manufacturing industries. The purpose of this blog is to share our experience at manufacturing plants all over the world, in a wide variety of industries, each with their own unique challenges and goals.

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Modifying Control Chart Sensitivity

Control limits are typically set at +/- 3 standard deviations for the statistic being plotted. That‘s how traditional Shewhart control charts have been constructed for nearly a century.

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Control Charts: Which One Should I Use? Part II

Selecting the right control chart starts by knowing something about what you want the chart to say about the process – what questions do you want the chart answer?

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Control Charts: Which One Should I Use?

Control charts, ushered in by Walter Shewhart in 1928, continue to provide real-time benefits in today’s most modern factories. When first introduced, there were seven basic types of control charts...

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The Tabular Cumulative Summation (CUSUM) Chart

Dr. Shewhart’s original control charts have been around for nearly 100 years. Since then, many different quality control texts have been written which highlight modifications to his techniques...

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Dr. Douglas Montgomery: A Sampling of His Expertise

We recently announced that Dr. Douglas Montgomery will be the Keynote speaker at our fifth annual user conference, Infusion 2011, on October 16-19 in San Francisco. 

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Video: The ROI of an SPC Software Solution

In February, I gave a presentation to attendees of the Pacific Design & Manufacturing Show. This event took place in Anaheim, CA and attracted manufacturing professionals from thousands of...

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It's Out of Control

In my last blog, we discussed the importance of using control limits that are calculated from a true measure of the process variation. Now that we have the correct limits, we can use them to...

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