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Achieving Customer Specifications through Process Improvement Using Six Sigma: Case Study of NutriSoil--Portugal

Summary: This article presents a case study of the use of Six Sigma combined with the 5S workplace organization approach for process improvement. Tolerance limits are essential in production process management, as they determine consumer satisfaction. The use of statistical quality control tools allows for process improvement and the Cpk index enables its measurement. Above all, the adoption by businesses of lean tools has been crucial in reducing the variation of a process or a product, satisfying the consumer's specifications, eliminating defects, reducing operating costs, and, in short, increasing profitability. The NutriSoil Company in Portugal, a small and medium-sized enterprise (SME), sells fertilizer in bags. The company has had problems with its filling process due to excess weight of the bags. Results show that by implementing Six Sigma combined with the 5S program, NutriSoil achieved an improvement in its Cpk index for this process, which increased consumer satisfaction and a highly significant cost savings. This resulted in increased competitiveness.

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  • Topics: Process Capability
  • Keywords: 5S (visual workplace), Process capability analysis, Process capability (Cp), Process capability index (Cpk), Process improvement, Six Sigma, Statistical quality control (SQC), Case study
  • Author: Baía, Amândio Pereira
  • Journal: Quality Management Journal