The Worldwide Society of Automation (ISA) and the Worldwide Electrotechnical Fee (IEC) began creating the 62443 sequence of requirements in 2002. The sequence, which incorporates IEC/ISA 62443-3-3, was initially known as the ISA99 sequence and contained industrial automation and management methods safety (IACS) requirements created following the steering of the American Nationwide Requirements Institute (ANSI)