How we fill the customer's satisfaction? In Quality Control , we do the best for customer's satisfaction. But when we see from a selfish view, it is not for customer's satisfaction.
The company has relationship with various people and facts. In such relationsip, customers are special because they pay the money to the company.
The company is a customer from other comapnies because it buys tools and materials. The relationship with customers has a network structure. It is called "Supply Chain Management (SCM)". For example, the action for ROHS and REACH is a problem of SCM.
In a factory, the people of the next process is a customer of previous process. People who get the result of your work is your customer. In this thought, everyone has its own customers.
This idea prevents that bad products go to the next process.