The goal of this book is to bring to the forefront the huge benefits to energy and facility managers of the emergence and continuing development of technologies and applications in the area of energy information and control systems. This wave of information technology (IT) and web-based energy information and control systems (web based EIS/ECS) continues to roll on with increasing speed and intensity. This handbook provides a presentation of technological advancements in this field over the last several years. The combined thrust of this information is that the highest level functions of the building and facility automation system are delivered by a web based EIS/ECS system that provides energy management, facility management, overall facility operational management, and ties in with the enterprise resource management system for the entire facility or the group of facilities being managed.