Control chart
Control chart (hereinafter, the Chart) is a quality-control tool that represents a graphic display of the results, over time and against established control limits, of a process. They are used to determine if the process is in control or in need of adjustment.
Definition
According to Juran's Quality Handbook by Defeo (7th edition),
- Control chart. A graphical tool used to determine if a process is in a state of (usually statistical) control over time. Most popular are Shewhart statistical process control charts.
According to Cost Accounting by Horngren, Datar, Rajan (14th edition),
- Control chart. Graph of a series of successive observations of a particular step, procedure, or operation taken at regular intervals of time. Each observation is plotted relative to specified ranges that represent the limits within which observations are expected to fall.
