Six Sigma DMAIC Process - Control Phase - Leading Indicator vs Lagging Indicator
While interpreting control charts we also talk of two indicators:
A leading indicator shows the trend before the defect occurs. For example, you may be able to see a trend of six downward points. This is a leading indicator that the process will produce a defect outside the lower control limit.
A lagging indicator is an outlier that is already outside the upper or lower control limit. This is a lagging indicator that the defect has already occurred in the process.