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Defect

Defects in production and manufacturing are deviations from a product’s intended design or quality standards, leading to items that are unsafe, unreliable, or unsatisfactory for consumers. These can arise at any stage of the manufacturing process. Table of...

Decision Rules

The Western Electric (WECO) rules spc, are decision rules used in Statistical Process Control to detect “out-of-control” or non-random conditions. The location of the observations relative to the control chart limits (typically at +-3 standard deviations)...

Cyclical Variation

Cyclical variation is often used to describe a repeating pattern, such as a seasonal variation in sales that peaks before Christmas. Cycle time variation is a metric and philosophy for continuous improvement with the aim of driving down the deviations in the time it...

Curvature

In mathematics, curvature is any of several strongly related concepts in geometry. Intuitively, it is the amount by which a curve deviates from being a straight line, or a surface deviates from being a plane. In an...

Cpk

Cpk and Cp are short-term capability measures for a particular process. Six Sigma describes process quality in terms of sigma. This allows us to easily talk about the capabilities of different processes using a common mathematical framework, it’s...
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