The aim of the IEC 61508 is to enable the development of Electrical or Electronic or Programmable Electronic (E/E/PE) safety-related systems. Part 5 Example of methods for the determination of safety integrity levels Part 1 Development of overall safety requirements Part 1 Allocation of safety requirements ot the E/E/EP safety-related system Part 1 Specification of the system safety requirements for the E/E/PE safety-related system Part 2 Realisation phase for E/E/PE safety-related systems Part 3 Realisation phase for safety-related software Part 6 Guidelines for the application ofParts 2 and 3 Part 7 Overview of techniques and measures Part 1 Installation, commissioning and safety validation of E/E/PE safety-related systems Part 1 Operation, maintenance, repair, modification and retrofit, decommissioning or disposal of E/E/PE safety-related systems