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Thep4oomance basedANSI/ISA S84.01 and IEC 61508 s t a d r h rmide overul? risk based sujty I$ cle modehjr bacic methodolo und p i l i n e s K t h e identification of s&established target risk leveh. In or er to arrive at risk based solutions, many practical issues need to be addressed. Such issues include identification of target risk heh, identification ofhazardous events associated with the rocess under considprocess, and selection of appropriate non-instrumented and hstrumented sajty systems to meet the target risk. This paper outlines the basic methoahlogy and discusses some ofthe rehted issues mentioned above. Furthe r o v h a f w methodohgies to establish the requirements safety instrumented ystm and their sajty integrity h e industria P processes. Amon other idznce, t x eyprovide the ty instrumente 5iy systems necessary or aprocess to meet the eration, establishing the existing ris 1 associated with the f