CONTROL CHART Meaning and
Definition
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A control chart is a statistical tool used to monitor and control a process over time by graphically displaying its performance. It is a visual representation that helps in determining whether a process is under control or is experiencing variation beyond acceptable limits. Control charts are widely used in process improvement and quality management methodologies, such as Six Sigma.
The control chart consists of a plot with time on the horizontal axis and a relevant measure of the process performance on the vertical axis. It typically includes three horizontal lines: a centerline that represents the average or target value, and two control limits that represent the acceptable range of variation. Control limits are usually set as three standard deviations above and below the mean or other predetermined thresholds.
By plotting data points over time and comparing them to the control limits, one can assess whether the process is stable or experiencing special causes of variation. Data points falling within the control limits suggest that the process is under control and operating within acceptable performance levels. On the other hand, if data points fall outside the control limits or display non-random patterns, it indicates the presence of special causes of variation that need to be identified and addressed for process improvement.
Control charts provide a visual representation of the process performance, enabling quick identification of deviations and facilitating data-driven decision-making. They help in identifying when and where to take corrective actions, thereby enabling organizations to maintain control, reduce variability, and enhance overall process quality.
Common Misspellings for CONTROL CHART
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Etymology of CONTROL CHART
The word "control" originated from the Middle English term "countrolen" in the early 15th century. It comes from the Old French word "contreroller", which means "to keep a check on". The term "chart" originated from the Latin word "charta", which means "paper" or "leaflet". In the context of a control chart, the term "control" refers to the act of monitoring and managing a process, while "chart" refers to the graphical representation used to display the data and the process control limits. The combination of these words, "control chart", refers to a graphical tool used for statistical quality control to monitor and maintain process stability and control.
