Application of lean six sigma methodology to improve the weight inconsistency problem of coffee powder packaging

  • Nik Alimi Nik Aziz Universiti Malaysia Perlis (UniMAP)
  • Rosmaini Ahmad Universiti Malaysia Perlis (UniMAP)
  • Shaliza Azreen Mustafa Universiti Malaysia Perlis (UniMAP)
  • Tan Chan Sin Universiti Malaysia Perlis (UniMAP)
  • Muhammad Shahar Jusoh Universiti Malaysia Perlis (UniMAP)
Abstract views: 1337 , PDF downloads: 1659
Keywords: Continuous improvement, Lean six sigma, Poka yoke, Case study, Coffee manufacturing industry


This paper presents a continuous improvement (CI) project based on the application of Lean Six Sigma (LSS) methodology. This project was carried out at coffee manufacturing industry located in northern area of Malaysia. The focus of this presented CI project is to improve the weight inconsistency problem of coffee powder packaging. The presented CI project was mainly guided with Six Sigma methodology of Define, Measure, Analyze, Improve and Control (DMAIC) steps, and related Lean tools applications. The step of Define summaries the overall view of CI project. In the step of Measure, current level of sigma based on defect per million of opportunities (DPMO) calculation was determined. Initially, 6% of rejected products were recorded, which it presents the sigma level at 3.1. In the step of Analyze, a series of team-based activities towards root cause identification was carried out. It included the applications of cause effect (CE) analysis and possible causes prioritization and close observations on packaging process. In the step of Improve, the related Lean tool was proposed to improve the problem under study. In the final step of Control, related supportive actions were suggested to sustain the effectiveness of the proposed solution. There are fourteen possible causes are initially identified in CE analysis and based on team’s evaluation process of possible causes prioritization four causes are collectively to be the most possible of root cause(s). Three close observation sessions were carried out to finalize the most possible root cause of the problem. Result strongly suggested that the high variation of coffee powder’s size and inconsistency is the root cause. An improvement strategy based on Lean Manufacturing approach called ‘poka yoke’ is proposed. The proposed improvement strategy was then validated based on real packaging process scenario. Result shows that the proposed improvement strategy is significantly effective to solve the problem with 0% of reject product was recorded so far, where it is not only produced the product within the acceptable weight of 215 and 208 grams, but also presents the reduction of weight fluctuation that close to ideal weight of 208 grams.


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J. Singh and H. Singh, “Continuous improvement philosophy – literature review and directions,” Benchmarking An Int. J., vol. 22, no. 1, pp. 75–119, Jan. 2015, doi:

J. H. Sheridan, “'Lean Sigma’ synergy,” Ind. Week/IW, vol. 249, no. 17, pp. 81–82, 2000. Available:

J. Hill, A. J. Thomas, R. K. Mason-Jones, and S. El-Kateb, “The implementation of a Lean Six Sigma framework to enhance operational performance in an MRO facility,” Prod. Manuf. Res., vol. 6, no. 1, pp. 26–48, Jan. 2018, doi:

R. Andersson, P. Hilletofth, P. Manfredsson, and O.-P. Hilmola, “Lean Six Sigma strategy in telecom manufacturing,” Ind. Manag. Data Syst., vol. 114, no. 6, pp. 904–921, Jan. 2014, doi:

M. P. J. Pepper and T. A. Spedding, “The evolution of lean Six Sigma,” Int. J. Qual. Reliab. Manag., vol. 27, no. 2, pp. 138–155, Jan. 2010, doi:

R. D. Adikorley, L. Rothenberg, and A. Guillory, “Lean Six Sigma applications in the textile industry: a case study,” Int. J. Lean Six Sigma, vol. 8, no. 2, pp. 210–224, Jan. 2017, doi:

A. Deithorn and J. V Kovach, “Achieving aggressive goals through Lean Six Sigma: A case study to improve revenue collection,” Qual. Eng., vol. 30, no. 3, pp. 371–388, Jul. 2018, doi:

J. Singh, H. Singh, A. Singh, and J. Singh, “Managing industrial operations by lean thinking using value stream mapping and six sigma in manufacturing unit,” Manag. Decis., vol. 58, no. 6, pp. 1118–1148, Jan. 2020, doi:

A. Sharma, N. Bhanot, A. Gupta, and R. Trehan, “Application of Lean Six Sigma framework for improving manufacturing efficiency: a case study in Indian context,” Int. J. Product. Perform. Manag., vol. ahead-of-print, no. ahead-of-print, Jan. 2021, doi:

B. Byrne, O. McDermott, and J. Noonan, “Applying Lean Six Sigma Methodology to a Pharmaceutical Manufacturing Facility: A Case Study,” Processes, vol. 9, no. 3, pp. 1–24, Mar. 2021, doi:

N. A. Panayiotou, K. E. Stergiou, and V. Chronopoulos, “Implementing a Lean Six Sigma standardized toolset in a manufacturing company: a case study,” Int. J. Product. Perform. Manag., vol. ahead-of-p, no. ahead-of-print, Dec. 2020, doi:

N. Nandakumar, P. G. Saleeshya, and P. Harikumar, “Bottleneck Identification And Process Improvement By Lean Six Sigma DMAIC Methodology,” Mater. Today Proc., vol. 24, pp. 1217–1224, 2020, doi:

L. B. M. Costa, M. Godinho Filho, L. D. Fredendall, and F. J. Gómez Paredes, “Lean, six sigma and lean six sigma in the food industry: A systematic literature review,” Trends Food Sci. Technol., vol. 82, pp. 122–133, Dec. 2018, doi:

L. B. M. Costa, M. Godinho Filho, L. D. Fredendall, and G. M. D. Ganga, “The effect of Lean Six Sigma practices on food industry performance: Implications of the Sector’s experience and typical characteristics,” Food Control, vol. 112, p. 107110, 2020, doi:

I. Setiawan and S. Setiawan, “Defect reduction of roof panel part in the export delivery process using the DMAIC method: a case study,” J. Sist. dan Manaj. Ind., vol. 4, no. 2, pp. 108–116, Dec. 2020, doi:

R. Sharma, P. Gupta, and V. Saini, “Six sigma DMAIC Methodology Implementation in Automobile industry: A case study,” J. Manuf. Eng., vol. 13, no. 1, pp. 42–50, 2018. Available:

N. Nelfiyanti, A. M. Rani, and A. Fauzi, “Implementasi Six Sigma untuk Perbaikan Kualitas Produk Kiwi Paste Berdasarkan Keluhan Pelanggan,” J. Sist. dan Manaj. Ind., vol. 2, no. 1, pp. 41–50, Jul. 2018, doi:

A. Tenera and L. C. Pinto, “A Lean Six Sigma (LSS) Project Management Improvement Model,” Procedia - Soc. Behav. Sci., vol. 119, pp. 912–920, 2014, doi:

V. Kumar, P. Verma, and V. Muthukumaar, “The Performances of Process Capability Indices in the Six-Sigma Competitiveness Levels,” 2018. Available:

M. Lazarevic, J. Mandic, N. Sremcev, D. Vukelic, and M. Debevec, “A Systematic Literature Review of Poka-Yoke and Novel Approach to Theoretical Aspects,” Strojniški Vestn. – J. Mech. Eng., vol. 85, no. 7–8, pp. 454–467, Jul. 2019, doi:

P. N. Richards, “A Study on Implementation of Poka– Yoke Technique iIn Improving the Operational Performance by Reducing the Rejection Rate in The Assembly Line,” Int. J. Pure Appl. Math., vol. 119, no. 17, pp. 2177–2191, 2018. Available:

E.-A. Attia, K. Khader, and O. Nada, “Mistake Proofing Cam Mechanism Through Six-sigma Process: Case Study on Clothes Printing Machines,” Int. J. Eng., vol. 32, no. 3, pp. 438–444, 2019. Available:

G. Hoellthaler, S. Braunreuther, and G. Reinhart, “Requirements for a methodology for the assessment and selection of technologies of digitalization for lean production systems,” Procedia CIRP, vol. 79, pp. 198–203, 2019, doi:

D. R. Putri and W. Handayani, “Zero Defect pada Produksi Kantong Kraft melalui Metode Poka Yoke di PT. Industri Kemasan Semen Gresik,” J. MEBIS (Manajemen dan Bisnis), vol. 4, no. 1, pp. 44–58, Jul. 2019, doi:

C. Rösiö, T. Aslam, K. B. Srikanth, and S. Shetty, “Towards an assessment criterion of reconfigurable manufacturing systems within the automotive industry,” Procedia Manuf., vol. 28, pp. 76–82, 2019, doi:

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How to Cite
N. A. N. Aziz, R. Ahmad, S. A. Mustafa, T. C. Sin, and M. S. Jusoh, “Application of lean six sigma methodology to improve the weight inconsistency problem of coffee powder packaging”, j. sist. manaj. ind., vol. 5, no. 2, pp. 74-86, Nov. 2021.
Research Article