American Journal of Industrial Engineering
ISSN (Print): 2377-4320 ISSN (Online): 2377-4339 Website: Editor-in-chief: Ajay Verma
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American Journal of Industrial Engineering. 2013, 1(2), 28-35
DOI: 10.12691/ajie-1-2-4
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Applying Lean Six Sigma for Waste Reduction in a Manufacturing Environment

Mohamed K. Hassan1, 2,

1The University of Akron Research Foundation, Akron, OH, USA

2Arab Academy for Science, Technology and Maritime Transport, Alexandria, Egypt

Pub. Date: October 18, 2013

Cite this paper:
Mohamed K. Hassan. Applying Lean Six Sigma for Waste Reduction in a Manufacturing Environment. American Journal of Industrial Engineering. 2013; 1(2):28-35. doi: 10.12691/ajie-1-2-4


This study was applied in a welding wire manufacturing plant to improve the quality of the manufactured welding wires, reducethe manufacturing waste and increase the yield of the manufacturing process, by applying the Lean Six Sigma (LSS) methodology and waste management. LLS is considered one of the successful approaches in the field of quality improvement and cost reduction. The case study plant working environment was analyzed to isolate the root causes for the waste generation. Remedies and countermeasures were suggested and some were implemented. The study compares the performance of the plant before and after implementation of the proposed solutions for waste reduction. Improvements in yield, waste, Defects Per Million Opportunities (DPMO), and sigma levels were achieved.The LSS methodology was linked to the Analytic Hierarchy Process (AHP) to prioritize the causes of waste. The objective was to use an analytical method in judging the influence of the waste causes on the amount of waste to enrich the methodology effectiveness and facilitate some ease of use in the practical field.

Lean Six Sigma (LSS) Analytic Hierarchy Process (AHP) quality improvement waste management welding wire

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[1]  George, M. L., Rowlands, D. and Kastle, B. What is Lean Six Sigma, McGraw-Hill, New York, 2004.
[2]  Daryl, S., Beyond Six Sigma – A Control Chart for Tracking Defects per Billion Opportunities (dpbo), International Journal of Industrial Engineering: Theory, Applications and Practice, 16 (3): 227-233,2009.
[3]  Adan, V., Jaime, S., Salvador, N. and Berenice, G. N. Implementation of Six Sigma in a Manufacturing Process: A Case Study, International Journal of Industrial Engineering: Theory, Applications and Practice, 16 (3): 171-181,2009.
[4]  Desai, T.N. and Shrivastava, R. L., Six Sigma A New Direction to Quality and Productivity Management, Proceedings of the World Congress on Engineering and Computer Science, San Francisco, USA, October 22-24, 2008.
[5]  Vijayaram, T. R., Sulaiman, S., Hamouda, A. M. and Ahmad, M. H., Foundry quality control aspects and prospects to reduce scrap rework and rejection in metal casting manufacturing industries, Journal of Materials Processing Technology, 178: 39-43, 2006.
[6]  Raisinghani, M. S., Six Sigma: concepts, tools, and applications, Industrial Management & Data Systems, 105 (4): 491-505, 2005.
[7]  Kaushik, P., Khanduja, D., "DM make up water reduction in thermal power plants using Six Sigma DMAIC methodology", Journal of Scientific and Industrial Research, Vol. 67 No.1, pp.36-42, 2008.
[8]  Thomas, A., Barton, R. and Byard, P., Methodology and Theory Developing a Six Sigma maintenance model, Journal of Quality in Maintenance Engineering, 14 (3): 262-271, 2008.
[9]  Kumar, S. and Sosnoski, M., Reflective Practice Using DMAIC Six Sigma to systematically improve shop floor production quality and costs, International Journal of Productivity and Performance Management, 58 (3): 254-273, 2009.
[10]  Chakravorty, S., Six Sigma programs: An implementation model, Int. J. Production Economics, 119: 1-16, 2009.
[11]  Arthur, J., Lean Six Sigma Demystified. McGraw-Hill, United States, 2007.
[12]  Behara, R.S., Fontenot, G.F. and Gresham, A., Customer satisfaction measurement and analysis using Six Sigma, International Journal of Quality & Reliability Management, 12 (3): 9-18, 1995.
[13]  Pyzdek, T., The Six Sigma Handbook Revised and Expanded. McGraw-Hill, United States, 2003.
[14]  Black, k. and Revere, l., Six Sigma arises from the ashes of TQM with a twist, International Journal of Health Care Quality Assurance, 19 (3): 259-266, 2006.
[15]  Kreisler.K., Buch, and Tolentino A., Employee expectancies for Six Sigma success, Leadership & Organization Development Journal, 27 (1): 28-37, 2006.
[16]  Andersson, R., Eriksson, H. and Torstensson, H., Similarities and differences between TQM, Six Sigma and Lean, The TQM Magazine, 18 (3): 282-296, 2006.
[17]  Cornado, R.B. and Antony, J., Critical success factors for the successful implementation of Six Sigma project in organization, The TQM Magazine, 14 (2): 92-99, 2002.
[18]  Kwaka, Y. H. and Anbaribi, F. T., Benefits, obstacles, and future of Six Sigma approach, Technovation, 26:708-715, 2006.
[19]  Buch, K. and Tolentino, A., Employee perceptions of the rewards associated with Six Sigma, Journal of Organizational Change Management, 19 (3): 356-364, 2006.
[20]  Parast, M.M., The effect of Six Sigma projects on innovation and firm performance, International Journal of Project Management, 29 (1): pp. 45-55, 2011.
[21]  Womack, J.P., Jones, D.T. and Roos, D., The Machine that Changed the World, Rawson Associates, New York, NY, 1990.
[22]  Hicks, B.J., Lean information management: Understanding and eliminating waste, International Journal of Information Management, 27: 233-249, 2007.
[23]  Rathje, M. S., Boyle, T. A. and Deflorin, P., Lean take two Reflections from the second attempt at Lean implementation, Business Horizons, 52: 79-88, 2009.
[24]  Melton, T., The Benefits of Lean Manufacturing What Lean Thinking has to Offer the Process Industries, Chemical Engineering Research and Design, 83 (A6): 662-673, 2005.
[25]  Thomas, A., Barton, R. and Okafor, C. C., Applying Lean Six Sigma in a small engineering company a model for change, Journal of Manufacturing Technology Management, 20 (1): 113-129, 2009.
[26]  Katok, E., Serrander, T. and Wennstrom, M., Throughput improvement and scrap reduction in aluminum can manufacturing, Production and Inventory Management Journal, First Quarter , pp. 36-42, 1999.
[27]  Vokurka, R. J. and Davis, R.A., Quality Improvement Implementation: A case study in manufacturing scrap reduction, Production and Inventory Management Journal; Third Quarter, pp. 63-68, 1996.
[28]  Saaty, T. L., Applications of Analytical Hierarchies, Mathematics and Computers in Simulation, 21: 1-20, 1979.
[29]  Saaty, T. L., Multi-criteria Decision Making: The Analytic Hierarchy Process, McGraw-Hill, New York, 1980.
[30]  Saaty, T. L., How to make a decision: The Analytic Hierarchy Process, European Journal of Operational Research, 48: 9-26, 1990.