Lean Six Sigma implementation: results from the soft drinks industry

Janethkareen K. Kitsovi and Ismail W.R. Taifa

International Journal of Industrial and Systems Engineering, 2026, vol. 53, issue 4, 491-521

Abstract: This study applied the Lean Six Sigma (LSS) methodology in the soft drink industry's production process to analyse the rejects and propose potential strategies. The rejects produced were assessed using the DMAIC technique. Thirty-eight employees were involved, including 30 production line workers and eight top managers and/or supervisors. Historical soft drink production data showed a drop in a sigma level from 4.7 to 4.5. The deployment of the LSS methodology resulted in the potential saving of Tanzanian Shillings 85 million annually. The study provides strategies which can help factories successfully implement the LSS methodology, including deploying effective management, precise use of LSS tools and techniques, maintenance strategy, the establishment of the production strategic plan, improving reward and recognition, effective employee empowerment, appropriate selection of the project staff, effective cross-function management, linking of customer, business strategy and suppliers to LSS and effective training of staff according to LSS.

Keywords: Six Sigma; Lean Six Sigma; LSS; LSS methodology; Six Sigma methodology; SSM; DMAIC; product rejects; nine wastes; soft drink industry. (search for similar items in EconPapers)
Date: 2026
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