Evaluating the Effectiveness of Six Sigma in a Manufacturing Plant: Basis for Strategic Planning
DOI:
https://doi.org/10.67167/vertex.587Keywords:
manufacturing excellence, operational effectiveness, process improvement, quality management, , six sigmaAbstract
Six Sigma represents one of the most widely adopted quality management methodologies in manufacturing, yet empirical evidence quantifying its effectiveness across multiple performance dimensions remains limited, particularly in Philippine manufacturing contexts where implementation challenges and resource constraints may affect outcomes. This quantitative quasi-experimental study evaluated the effectiveness of Six Sigma implementation in a medium-sized electronics manufacturing plant in Laguna, Philippines, during 2025. Using a pretest-posttest design, the study compared operational performance metrics before and after 12-month Six Sigma implementation across four departments (production, quality assurance, maintenance, and supply chain) involving 180 employees. Data were collected through organizational records, process measurements, and structured surveys assessing Six Sigma implementation levels (training completion, project participation, tool utilization, cultural integration) and operational effectiveness indicators (defect rates, process capability, cycle time, cost of poor quality, productivity, customer satisfaction). Pretest measurements conducted in January 2025 established baseline performance, followed by systematic Six Sigma deployment including training, project teams, and DMAIC methodology application, with posttest measurements conducted in December 2025. Results revealed statistically significant improvements across all effectiveness indicators following Six Sigma implementation. These findings provide robust empirical evidence supporting Six Sigma effectiveness for manufacturing performance improvement and offer data-driven foundation for strategic planning decisions regarding quality initiative investments.
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