 This guidance applies to end-users (i.e.asset owner), system integrators, security practitioners, and control systems manufacturers responsible for manufacturing, designing, implementing, or managing industrial automation and control systems.These documents were originally referred to as ANSI/ISA-99 or ISA99 standards, as they were created by the International Society for Automation (ISA) 99 committee, accredited by and publicly released as American National Standards Institute (ANSI) documents.