Tracking performance over time can be accomplished using either one of two methods which are Run Charts or Control Charts. Both methods use time as the baseline and the performance measure as the measurement that is tracked over time. The major differences in the methods relate to the measures of demarcation on the charts. Run Charts have a center line that represents the mid point of the measurement that is being tracked. Control Charts have a center line that represents the average of the measurement that is being tracked and lines above and below the centerline that are estimates of 3 standard deviations about the average of the measurements.
Whenever we contemplate improving a process the baseline for the critical performance metric(s) must be established before any corrective actions are taken. By doing this you will always be able to evaluate the impact of the improvements by measuring from the baseline to the future state of process performance. In the rare case where the corrective action doesn’t work the tracking charts will point that out quickly so an alternative action can be taken. I am sure that you can remember when a great idea just did not work so it is always best to track performance to validate the actual impact of our improvement efforts.
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