{Building Systems
	{Wiring Systems
		{Phone System }
		{Electrical System }
		{Building Computer Network }
	}
	{Security System
		{Key Card System}
		{Video Cameras}
		{Glass Breakage Sensors}
		{Emergency Exit Alarms}
	}
	{HVAC System
		{East Zone System}
		{Central Zone System}
		{West Zone System}
	}
	{Lighting System
		{Office Lighting}
		{Laboratory Lighting}
		{Corridor Lighting}
		{Bathroom Lighting}
		{Classroom Lighting}
		{Auditorium Lighting}
		{Discussion Lounge Lighting}
	}
}