Referring to the case study by Cabrera , Corpus , Maradiegue and lvarez (2020), Answer the following questions: ( 800 WORDS ) 1- What were the main solutions/ approaches implemented in the case study? 2- How did the author justify rationally the use of these approaches and how did they connect them with the problems and their causes? 3- Illustrate the underlying concepts, purpose and procedures related to the SPC and Lean..