Analyze In this phase, theories are generated as to what may cause the problem and by means of testing the theories, root causes are identified.
• Improve In this phase, root causes are removed by means of designing and implementing changes to the process that has been producing the problem.
• Control In this phase, new controls are designed and implemented, which prevent the original problem from returning and which hold the gains made by the improvements.
• Replicate In this phase, the knowledge, insights, and know how acquired by the team are used to correct
other quality problems and to identify new quality improvement projects.
The Roadmap of Six Sigma approach is given below.
0 0.02 0.04 0.06 0.08
Case Study: ‘‘reduction in rejection of gear box housing due to tapper in cross-hole’’
Here, the Objective is to reduce the possibility of rejection of gear box housing due to tapper in cross-hole.