Damage does not significantly affect structural properties in spite of a minor loss of stiffness. Restoration measures are cosmetic unless the performance objective requires strict limits on nonstructural component damage in future events.
Slight
Damage has a small effect on structural properties. Relatively minor structural restoration measures are required for restoration for most components and behavior modes.
Moderate
Damage has an intermediate effect on structural properties. The scope of restoration measures depends on the component type and behavior mode. Measures may be relatively major in some cases.
Heavy
Damage has a major effect on structural properties. The scope of restoration measures is generally extensive. Replacement or enhancement of some components may be required.
Extreme
Damage has reduced structural performance to unreliable levels. The scope of restoration measures generally requires replacement or enhancement of components.