SIS definition & purpose, 3 SIF components (Sensor/Logic Solver/Final Element), detailed tables for sensors, logic solvers & final elements, complete SIF worked example (reactor high pressure), SIS vs BPCS comparison (concept + detailed table), Protection layers onion model, SIDA criteria for IPLs, IPL PFD values table, SIL overview table, IEC 61508 (7 parts), IEC 61511 (3 parts), related standards, key terminology, common SIF examples