The present work has been carried out in order to detect how the application of the Lean Manufacturing methodology improves the purchasing process for the Chamber of Commerce and Production of La Libertad in 2019. The problem formulated for the research was: In what way the Lean Manufacturing methodology contributes to the improvement of the purchasing process in the Chamber of Commerce and Production of La Libertad? and it was hypothesized: The Lean Manufacturing methodology improves the purchasing process for the Chamber of Commerce and Production of La Libertad. Likewise, the general objective was: to detect how the application of the Lean Manufacturing methodology improves the purchasing process for the Chamber of Commerce and Production of La Libertad in 2019. There was a population of 6 sub-processes of the purchasing process on which was equal to the sample taken. The research des...