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A Control Chart is a tool you can use to monitor a process. It graphically depicts the average value and the upper and lower control limits (the highest and lowest values) of a process.
All processes have some form of variation. A Control Chart helps you distinguish between normal and unusual variation in a process. If you want to reduce the amount of variation in a process, you need to compare the results of the process with a standard.
Variation can exist for two reasons:
- Common causes are flaws inherent in the design of the process.
- Special causes are variations from standards caused by employees or by unusual circumstances or events.
Control charts for measurements
X-bar charts
R charts
Control charts for compliance items
P charts
c charts
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