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From supply driven to requirements driven
Process plant
BPCS
SIS
FGS
Instrument
supplier A
Instrument
supplier B
Instrument
supplier C
Logic solver
supplier
Valve
supplier A
Valve
supplier B
Valve
supplier C
Spec A
Spec B
Spec C
C&E chart
I/O list
Block diagram
Spec A
Spec B
Spec C
P&ID
Discipline driven specifications, all attributes.
Safety
Requirements
Specification
Process focussed
SIS Safety Requirements – SIF Safety requirements – Device Safety Requirements