Abstract : This paper introduces the concept of generalized reliability and proposes two major paths for increasing generalized reliability in CNC system development, along with specific operating procedures. Keywords : CNC system; generalized reliability CNC systems are widely used in various electromechanical equipment. Due to the complexity of CNC systems and the importance of control, their reliability requirements are generally high. High reliability is the guarantee for the application of advanced control methods. However, once the reliability of any product is improved to a certain level, further improvement becomes very difficult, requiring significant investment but yielding minimal results. This is because at this level, all eliminateable defects have been eliminated, leaving only uncontrollable and unpredictable defects. The failures caused by these defects are accidental failures, which are difficult to eliminate. For most CNC systems, although high reliability is required, failures are not completely unacceptable; therefore, they are all repairable systems. Since they are repairable systems, discussing only the narrow reliability of the system is of little practical significance; instead, we must consider generalized reliability, including maintainability. 1. The Concept of Generalized Reliability Generalized reliability is also called effectiveness. For repairable products, it is an evaluation of the product that combines reliability and maintainability. Generalized reliability is a measure of generalized reliability, representing the probability that a product will maintain its operational capability within a specified timeframe. It is denoted by A(t) and is a function of time. For example, A(300) = 0.96 means that out of 100 devices operating for a specified period of 300 hours, an average of 96 devices will be in normal working condition. The number of devices that fail during this period, and when they fail, is irrelevant; as long as they are repaired within the specified time, ensuring that 96 devices are operational by the end of the 300-hour period, the target is met. If A = 0.96 for a single device, it means that the device is in an effective state 96% of the time, allowing for occasional breakdowns and repairs. This differs from R(300) = 0.96, where g(300) = 0.96 indicates that the probability of a device operating normally for 300 hours without failure is 96%. [b][align=center]For more details, please click: Generalized Reliability Growth in CNC System Development[/align][/b]