Published guidance on metrics

This 2nd edition of ISA-TR84.00.04-1 amends and updates some guidance, but predominantly expands guidance related to user approval (Annex L), setpoint determination (Annex Q), and performance metrics (Annex R). Additional guidance on applying SIS as well as instrumented protective systems can be found in CCPS Guidelines for Safe and Reliable Instrumented Protective Systems, published in 2007. 

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