# U Chart Definition and Explanation PDF | Download eBooks

Learn *U Chart* definition in total quality management with explanation to study “What is U Chart”. Study u chart explanation with TQM terms to review total quality management course for online MBA programs.

## U Chart Definitions:

U chart is a graph of the average number of defects per unit.

Managing Quality: Integrating the Supply Chain by S. Thomas Foster

A control chart based on the average number of nonconformities per inspection unit is called u chart.

Introduction to Statistical Quality Control by Douglas C. Montgomery

## U Chart Explanation:

U chart is a type of attribute control chart which is used when the sample size is greater than 1. It shows the average number of non-conformities in a unit. When using u chart, the size of one subgroup can be different from another. In case of u charts, items in a subgroup can have multiple defects. Control limits for u chart are established using the already defined formula. Usually, lower control limit of a u chart is calculated to be a negative number, so zero (0) is used as the lower limit of u charts. U charts are plotted based on Poisson distribution.

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