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This new standard provides a guide for HAZOP studies of systems using guide words. It gives guidance on application of the technique and on the HAZOP study procedure, including definition, preparation, examination sessions and resulting documentation and follow-up. Documentation examples, as well as a broad set of examples encompassing various applications, illustrating HAZOP studies are also provided. The responsible committee is DKE/K 132 "Zuverlässigkeit" ("Reliability") of the DKE (German Commission for Electrical, Electronic and Information Technologies) at DIN and VDE.