This ARPO service category is based on the Safety Instrumented Systems life cycle as established in ANSI/ISA 84.00.01-2004 and IEC 61511-1, in order to offer design analysis, review of bid specifications, development of the engineering documents, preparation of the system operating philosophy, preparation of engineering documentation for the safety instrumented system (cabinets diagrams, one-line drawings, calculation reports, equipment specifications, SIS system programming and its Human–Machine Interface, factory assembly of equipments, Total Factory Operation Tests, onsite installation supervision, onsite acceptance tests, commissioning and system performance tests.