Not sure if this is the best forum for this so please move if not. Those in the quality field know that actions we take whether long term projects or the day to day decisions save the company money. With bigger projects its pretty easy to calculate cost savings but I need some ideas on calculating the following. Lets say a customer rejects a batch of parts for being out of spec. Because you have built a good relationship with them and have thorough knowledge of their product you are able to convince them to issue a deviation to use the material in question. Another one I deal a lot with is the customer has an issue with another vendors part that assembles to ours. They review our part and the first thing they "perceive" wrong is automatically deemed the root cause of the assembly issue and they reject the parts. I then do my due diligence and prove to them the issue is not our part but the other vendors mating component. Are these cost savings or just part of the job? Feedback would be greatly appreciated.