... function 557, 558 safety intent specification 531 safety mar gin 20, 31, 67, 71, 72, 108, 416 safety protection system 616 safety risk 655 safety system 89, 688 safety systems design, cause-consequenceanalysis ... fuzzy logic 170 engineering design analysis 172post -design testing and training 742potential energy 342potential failure 141, 362potential risk 676PPI see parameter profile index, seeparameter ... modelling 142modelling uncertainty 174steps for performing 80types and benefits 79worksheet 85failure modes and safety effects (FMSE)650, 667Index 819incidence matrix 477incompleteness 15independent...