Whether you’re new to the quality and continuous improvement arena or a seasoned expert seeking detailed information on a specific quality topic, you should find what you need in our Glossary of Terms.

Explore the concepts, tools, applications and technical terms that make up the world of continuous improvement.

u Chart

A u-Chart is used to graphically display attribute data and is a control chart of the average number of defects per part in a subgroup.

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Uniform Distribution

Uniform Distribution is a distribution in which all outcomes are equally likely.

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Upper Control Limit (UCL)

Upper Control Limit (UCL) for control charts is the upper limit below which a process statistic must remain to be in control. Typically the value is three standard deviations above the centre line.

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Upper Specification Limit (USL)

Upper Specification Limit (USL) is the highest value of a product dimension or measurement which is acceptable.

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