A control chart is used to monitor a process variable over time. That process variable can be plotted on a control chart over time. The objective of the control chart is to find any “special” causes of variation as well as to reflect the process improvements that have been made.Click to see full answer. Correspondingly, what is the purpose of a control chart?The control chart is a graph used to study how a process changes over time. Data are plotted in time order. 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. These lines are determined from historical data.Subsequently, question is, how are control charts used to improve quality? How To Use Control Charts To Improve Manufacturing Quality. The main purpose of control charts is to help determine if a process is stable and in-control, or unstable and out-of-control. When a process is stable, or “in control,” this means that it is predictable and affected only by normal random causes of variation. Simply so, what are the advantages of control charts? Benefits of using control charts to monitor accounting processes include higher quality services, reduced costs, and higher profitability. A control chart is a graph that contains a centerline, and upper and lower control limits. The centerline represents the process average.What is control chart and its types?Control Charts. In statistics, Control charts are the tools in control processes to determine whether a manufacturing process or a business process is in a controlled statistical state. This chart is a graph which is used to study process changes over time. The data is plotted in a timely order.