In the final step Control, the focus is on project improvement and sustainability. Some of the important activities during this stage include the design of standards and procedures, execution of statistical process control, ascertaining process capability, checking benefits, costs and revenue expansion. It also includes taking remedial action as the need be, so that the project is brought back to its nominal value. Control chart is an important tool used during this stage. It is a statistical method based on “continuous monitoring of process variation. The chart is drawn using upper and lower control limits along with a center or average value line. As long as the points plot within the control limits, the process is assumed to be in control.” (Drake, et.al, 2008, p.29) In sum, Six Sigma improves efficiency in production and service processes while also helping keep costs down. It remains a potent tool for Project Managers across various industries.
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