Why use it: u-Charts are used to determine if the process is stable and predictable, as well as to monitor the effects of process improvement theories.

When to use it: u-Charts show how the process, measured by the number of nonconformities per item or group of items, changes over time. Nonconformities are defects or occurrences found in the sampled subgroup. They can be described as any characteristic that is present but should not be, or any characteristic that is not present but should be. For example, a scratch, dent, bubble, blemish, missing button, and a tear are all nonconformities.

How to use it: The construction of a u-Chart generally follows the following steps:

1. Collect the samples and record the sample number (i), number of defects (c), and sample size (n)
2. Calculate u
3. Calculate centre line
4. Calculate UCL and LCL
5. Plot the axis
6. Check graph for control issues

Please refer to template for further information, the calculations will automatically be calculated in the template.

Name Format Preview (Click to enlarge)   u Charting Tool Template Microsoft Excel Format   u Charting Tool Graph Microsoft Excel Format   u Chart Production Template Adobe PDF Format

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