Enterprise architecture is a rising discipline that is gaining increasing interest in both industry and academia. It pays attention to the fact that effective management of business and IT needs take a holistic view of the enterprise. Enterprise architecture is based on graphical models as a vehicle for system analysis, design, and communication. Enterprise architecture is also a potential support for control systems management. Unfortunately, when it comes to security analyses, the architectural languages available are not adapted to provide support for this. This presentation focus on research performed as part of the EU seventh framework program VIKING (Vital Infrastructure, Networks, Information and Control Systems Management) and the Swedish Centre of Excellence in Electric Power Engineering, EKC2. The research is focusing on developing and adapting security analyses frameworks to architectural languages on a level where information about control systems' configuration is scarce and thus incomplete and partly unreliable.