As mentioned in the lecture, the ways we can do for effectively monitoring product quality and collaboration between different departments is to simply make strict principles and rules to comply with. In a big company, there are a lot of departments running inside, and it’s nearly impossible to make everyone listen to a manager from one department to tell them what to do, why their job is not perfect and what they need to do instead for just ensuring the quality control. It will be deemed as offenses sometimes, and will cause more people unwilling to collaborate properly. However, under a series of strict but lawfully-allowed company regulation rules, for example, PDCA cycle, everybody should only be allowed to do exactly what they need to do in that phase, to run the project smoothly and no more arguments going.