The improvement phase is where the team generates the list of possible solutions based on the analysis of the results where the root cause is confirmed. Again, a full discussion is beyond the scope of this article, but you can easily find more information on this topic.
The tools used in the control phase are the existing analytics tools used in the measurement phase. A good tool to monitor the results is Google Analytics, which substitutes for the statistical process control in manufacturing processes.
Statistical process control, however, has control limits, whereas there are no specification limits in Google Analytics charts. But performance baseline/reference data gathered in the measurement phase can serve as a basis to formulate some limits for quality control purposes.
This is only a snapshot of the Six Sigma-based project. In the next part, you will read a case study example of a Six Sigma project.
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