This versatile data collection and analysis tool can be used by a variety of industries and is considered one of the seven basic quality tools.Ĭontrol charts for variable data are used in pairs. By comparing current data to these lines, you can draw conclusions about whether the process variation is consistent (in control) or is unpredictable (out of control, affected by special causes of variation). These lines are determined from historical data. A control chart always has a central line for the average, an upper line for the upper control limit, and a lower line for the lower control limit. The control chart is a graph used to study how a process changes over time. Quality Glossary Definition: Control chartĪlso called: Shewhart chart, statistical process control chart ![]() Try Plan-Do-Study-Act (PDSA) Plus QTools™ Training:
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