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   2. Nihal Erginel and Aytac Hasirci Reduce the Failure Rate of the Screwing Process with Six Sigma Approach.
   3. Shashanka Soni, Ravindra Mohan, Lokesh Bajapi and S.K. Katare, Reduction Of Welding Defects Using Six Sigma Techniques.
   4. Abdulaziz A. Bubshait, and Abdullah A. AlDosary, Application of Lean Six-SigmaMethodology to Reduce the Failure Rate of Valves at Oil Field.
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