IEC 60964:2009 provides functional design requirements to be used in the design of the main control room of a nuclear power plant to meet operational and safety requirements. Also provides functional interface requirements which relate to control room staffing, operating procedures, and the training programmes which, together with the human-machine interface, constitute the control room system. This new edition takes into account the fact that software engineering techniques advanced significantly in the intervening years and introduces consistency with the latest revisions of relevant IAEA documents.