In the critical infrastructure industry, situational awareness, system safety, and user and system performance are paramount. Human error can be costly not only to the organization, but also to the public in general. CAE's Integrated Enterprise Solutions group supports critical infrastructure organizations, such as nuclear power plants and transportation authorities, through the application of its user-centred, simulation-based approaches to analysis, design, and experimentation. Our human systems integration (HSI) team has extensive experience supporting the design of operation and control centres as well as implementing HSI programs that emphasize system safety, user performance, personnel requirements, and training. Our team uses simulation-based tools to conduct task and workload analyses, evaluate individual, team, and system performance, and to design workstations and user interfaces.