scope:

This International Standard aims to: • describe the requirements to apply when reliability block diagrams (RBD) are used in dependability analysis; • describe the procedures for modelling the dependability of a system with reliability block diagrams; • explain how to use RBDs for qualitative and quantitative analysis; • describe the procedures for using the RBD model to calculate availability, failure frequency and reliability measures for different type of systems with constant probabilities, non-repaired blocks or repaired blocks; • propose some theoretical elements to perform the calculations; • explain the relationships with fault tree analysis (IEC 61025) and Markov techniques (IEC 61165).