A control chart is a graph that is used to study how different processes change with differing periods. Control chard possesses a central line referred to as the average, an upper line representing the upper control limit, and a lower line, which resembles the lower control limit. One of the purposes of a control chart is to monitor processes to those special causes of variation that can occur, also remove them, thus preventing them from occurring again. Calculations can eliminate the reason for the particular cause since it is in statistical control. Another purpose of the control chart is to estimate the average process. Research has shown that it is essential to recall that the standard deviation or calculated average has no purpose until statistical control.
Additionally, judging the impacts of your process-improvement efforts is another purpose of the control chart. Research has shown that after the processing of change has worked, new control limits are calculated. The process can eventually be monitored in the future for any appearance of special causes.