The objective of this Standard is to establish an industry approach for managing: a) the risks associated with integrating complex systems; b) the design and implementation of complex system interfaces; and, c) the planning, conducting and reporting on system integration testing (SIT). This Standard defines an approach to support the preparation and execution of system integration for rail projects in Australia. It provides processes to support the definition, control and optimization of integration processes used within an organization or project that can be applied by the adopter when delivering railway systems. This Standard is targeted at railway systems integrators such as operators, delivery authorities, prime contractors and alliances, or other bodies involved in integrating systems for or into a railway environment. Specifically, activities that result in changes or creation of railway configuration or operation.