Sánchez, E., Banda, L., Guerra, K. and Moposita, P. 2021. Application of the Six Sigma Methodology to reduce the variability of quality in the production of yarn for Flat Weaving. Ecuadorian Science Journal. 5, 3 (Nov. 2021), 125-137. DOI:https://doi.org/10.46480/esj.5.3.149.