Is the activity or action that causes? The Assembly or installation of a building, structure, facility, or a component of what is discussed above, and usually refers to a large part of the civil.
Activities or actions that cause. Assembly or installation The structure is building infrastructure. Or components of the above. And often refers to the work of civil majority.
Is an activity or action that caused the assembly or installation of a building structure system utilities or components of what mentioned above. And usually means the hosts.