compartmentation

Division into compartments; compartmentalization.

The fire spread rapidly after the building's compartmentation failed.

The reason for this compartmentation is FLAMETIGHT INTEGRITY. The purpose should be obvious: Propellent powder in flammable silk bags is always dangerous; compartmentation confines flame and explosive gas to the space in which it originates.

Division into compartments; compartmentalization.

The Titanics compartmentation' did not stop water from entering rooms.

Compartmentation of the hull.—It has become the accepted practice in conventional rigid-airship construction to subdivide the buoyant gas into numerous independent containers[…]

The dissemination of information and knowledge between different people or organisations on a need-to-know basis, so as to reduce the risk of espionage should one person or organisation be compromised externally; compartmentalization.

Nevertheless the principles of compartmentation of information and need to know are essential to secrecy.