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Definition: Control charts are a graphic display of the results, over time, of a process. They are used to determine if the process is “in control” (e.g., are differences in the results created by random variations, or are unusual events occurring whose causes must be identified and corrected?). When a process is in control, the process should not be adjusted. The process may be changed to provide improvements, but it should not be adjusted when it is in control.
Control charts may be used to monitor any type of output variable. Although used most frequently to track repetitive activities, such as manufactured lots, control charts can also be used to monitor cost and schedule variances, volume and frequency of scope changes, errors in project documents, or other management results to help determine if the project management process is in control. The example shown is a control chart of project schedule performance.
Acceptance Level:  Generally accepted

Alternative or Related Terms: Quality control

Application Areas/Intended Uses: Control charts are a tool or technique used in quality control.

Chief Advantages: Control charts serve to determine whether a process has been progressing properly within parameters established for the project.
Additional Reading:
Statistical Quality Control, Seventh Edition. Eugene L. Grant and Richard Leavenworth. McGraw Hill, 1996.