Applying Lean Six Sigma Methodology to Improve Productivity: Case Study at a Mooncake Production Enterprise

Authors

  • Nguyen Khac Hieu Falculty of Economics, Ho Chi Minh City University of Technology and Education, Vietnam
  • Nguyen Thi Anh Van Falculty of Economics, Ho Chi Minh City University of Technology and Education, Vietnam
  • Duan Khuu Falculty of Economics, Ho Chi Minh City University of Technology and Education, Vietnam
  • Thi My Hanh Nguyen Industrial Engineering and Management, Yuan Ze University, Taiwan

DOI:

https://doi.org/10.24425/mper.2025.154933

Keywords

lean six sigma, DMAIC, Delphi method, process capacity analysis, t-test, mooncake

Abstract

This study aims to apply the Lean Six Sigma methodology to reduce defect rates at a mooncake production company. The study reveals that the highest defect rate, recorded at 3.78%, occurred during the semi-finished product shaping stage. The research uses the Pareto chart to analyse the causes of the defects, while the Delphi method and cause-and-effect diagrams are applied to identify the root causes of the primary defects. To enhance the process, the research team adjust the technical specifications of the shaping mould and employ a t-test to evaluate the statistical significance of the improvement results. As a result, the defect rate was significantly reduced from 3.78% to 3.12%. This improvement leads to an increase in the Sigma level from 3.28 to 3.36, resulting in annual cost savings of USD 6,018 for the company. Looking ahead, the DMAIC methodology can be further applied to address other defect rates within the mooncake production process.

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Published

2025-06-30

How to Cite

Hieu, Nguyen Khac, et al. “Applying Lean Six Sigma Methodology to Improve Productivity: Case Study at a Mooncake Production Enterprise”. Management and Production Engineering Review, vol. 16, no. 2, June 2025, pp. [nr art. 11], s. 1-10, doi:10.24425/mper.2025.154933.

Issue

Vol. 16 No. 2 (2025)

Section

Artykuły