SINTEF have a long-lasting history of developing theory, methods and tools for design, validation, operation and evaluation of computer-based control and safety systems in the process industry. Main projects have been the so-called PDS projects on the reliability of instrumented safety-systems. Key deliverables from these projects have been the PDS method and the PDS data handbook. The PDS projects have also led to the establishing of PDS forum. This is a network hosted by SINTEF, aiming at the exchange of experience between Norwegian vendors, consultancy firms and users of control and safety systems.