Product Quality Optimization by Applying the Six Sigma Methodology: DMAIC in CV XYZ (A Case Study of an Indonesian Subcontractor Company)

Abstract

Reflecting the increasing demand in the motorcycle industry, it requires brands to sustain their product quality to meet customer satisfaction. The quality of the end product depends on the quality of spare parts. Hence, local suppliers were critical in ensuring the product quality is fulfilled. This research is limited only to CV XYZ which is known as a motorcycle spare part third-party supplier that is based in Cimahi, Indonesia. Recently, they faced decreasing customer trust because they obtained a “D” score in Performance Quality written in the Performance Supplier Report January 2023 that is sent by one of their customers. This research aims to identify solutions for the improvement of product quality. The Six Sigma Methodology DMAIC is the basis of this problem-solving research. The author utilizes historical data and undertakes the recommendation given by the previous study in literature reviews. The analysis proved that the process needs repair according to Performance Supplier Report. Three root causes of the issue with the shaper tools were overused, hasty working behavior, and lack of a monitoring system. Currently, these root causes were improperly handled. So, solutions proposed include reconditioning and scheduling, job rotation procedures, and the Poka-Yoke: Cleaning Numerator.