Infrastructure

Any activity has a structure supported by several infrastructures.
Infrastructure has a way of becoming an activity sometimes.
It exists at the physical, vital, mental, psychological levels.
An activity emerges using the infrastructure in the society.
Infrastructures are created as demanded by an activity.
Infrastructures have a way of being essential or inessential.
Infrastructures determine the efficiency of an activity.
Infrastructures sometimes can, in their sum, be all the structures.
Activity, structure, infrastructure is the general composition of a field.
Infrastructures suffer only functional definition and not theoretical precision.