Monitoring reactions to the plan for a produced item that meets the customer's requirements or not, how. Customer satisfaction in using it or not. The items are damaged or crashed before reaching customers only. The effort to bring what reason might be the 1 month with delivery to rehearse much? Why bring a return or to practice as much as possible by the introduction of defects in various parts of the new and improved, such as APPLE, because we are the most noticeable is the story of a battery. If we bring out the differences between version 6 and 5s to hen that APPLE has developed a way to battery of 6, it endured longer 5s makes the time we used the battery will fit between 1 day