This part 2 of EN 50126 • considers the safety-related generic aspects of the RAMS life-cycle; • defines methods and tools which are independent of the actual technology of the systems and subsystems;• provides:– the user of the standard with the understanding of the system approach to safety which is a key concept of EN 50126; – methods to derive the safety requirements and their safety integrity requirements for the system and to apportion them to the subsystems; – methods to derive the safety integrity levels (SIL) for the safety-related electronic functions.