Hakim, Herlyana Putra Azizul, and Wiwik Sulistiyowati. 2025. “QUALITY CONTROL OF SANDWICH PANEL PRODUCTS USING SEVEN TOOLS AND SIX SIGMA METHODS”. International Journal of Economic Integration and Regional Competitiveness 2 (8): 21-39. https://doi.org/10.61796/ijeirc.v2i8.390.