A building management system (BMS) is a computer-based control system provided in buildings to control and monitor the building mechanical and electrical systems, including cooling, lighting, irrigation, fire and life safety systems, security systems, etc.  The implementation of an automatic control system should be customized and based on the specific installed systems in a building to create a central interface of data collection and controls systems.  The BMS consists of a variety of components and can significantly reduce energy consumption and increase occupant comfort by integrating and optimizing the performance of multiple systems. A further benefit of the BMS is the recorded data available to facility managers.  This data is essential for calibration and optimization and can alert the facility manager to critical maintenance issues.