The present research aims to conduct an analysis and diagnosis of issues using Lean Manufacturing tools to reduce errors and lead times in the finishing department of a plastic products company. In response to the identified issues, several improvement proposals have been formulated through the application of Lean Manufacturing tools. Therefore, by implementing Poka Yoke, VSM, and SMED technique, the anticipated outcomes include a reduction in processing times, improved task distribution, and a decrease in improperly assembled products. Likewise, with the proposed designs and implementations, it will be possible to create a more organized work environment, leading to better resource management and, consequently, a more efficient product assembly. On the economic side, a significant increase in income could be seen. The reduction in production costs, facilitated by improvements in efficie...