This Second Volume is related to the Scientific Methods for managing Reliability, Availability, Maintenance and Spare Parts: it is written for Managers, Students, Researchers and Scholars in order they can take sound and managerial decisions. Many wrong cases (as it was for Volume one) of wrong methods are shown and compared to the Scientific Methods, in order to help the readers to learn how to avoid being cheated in their work and duty. The author has more than forty years' experience in the Quality Field and its Methods. Quality Methods in managing Reliability, Availability, Maintenance and Spare Parts provide great advantage to Companies dealing with such fields.