A type of attribute control chart that helps monitor the number or count of defects item by item, or by inspection units, in a production run.
A graphic presentation where one measured characteristic of a process is plotted over time. The control chart has a central line representing the average designated by X Bar, and Control Limits representing what the process can do when operating consistently. The Control Limits (Upper and Lower) are calculated statistically using actual data from the process.
One of the seven Tools of Quality used to show a moving picture of what really is going on with any given unit of operation of the process itself.