ISA TR84.00.07-2018 is informative and does not contain any mandatory requirements. This technical report is intended to be used in conjunction with other good engineering practices applicable to FGS installations. It is not intended to stand alone or be a replacement for application-specific practices. This technical report acknowledges but does not address mitigative effectiveness associated with notification appliances and personnel response requirements. This technical report is intended to: Be used by those with a thorough understanding of ANSI/ISA-84.00.01-2004. Clarify the additional information that should be considered when developing a performancebased FGS design. This includes development of a safety lifecycle model for FGS design and management. Clarify how to define FGS functions within typical FGS designs where automatic action is taken as a result of detection of a fire or gas event. Provide example scenario assessments to demonstrate the application of performance-based concepts to the analysis and design of FGS.