Building Operating Management, June 2014, by Jim Sinopoli.
http://www.facilitiesnet.com/buildingautomation/article/System-Integration-Can-Help-Meet-Green-Energy-Efficiency-Goals--15014

"Building owners seeking a green building certification or energy rating for a new building or a renovation generally push the idea of system integration to the background. To some extent this is understandable. They're probably familiar with integration involving the fire alarm, smoke control, elevators, and access control — essentially life safety integration. But they may not be aware of the functional benefits of integrating other systems and the opportunities to analyze an integrated database of system data points."