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How effectively, safely, and efficiently an asset or facility performs its mission (function) at any time during its life cycle. 

A building's performance state, which changes during time in service, is reflected by two different indicators: 

The physical condition state relates to a facility's general "physical fitness," independent of its mission, as it deteriorates due to routine aging, excessive or abusive use, or poor maintenance. 

The functionality state relates to the facility's suitability to function as intended and required for the mission. The functionality state is distinct from, and determined independently from, the physical condition state. See functional categories.

Condition-based metrics such as the condition index (CI) have been used by the Army for decades, but a companion index of functionality was not developed at the same time. However, to fully describe a building's fitness for changing missions over its entire life cycle, a quantitative and objective functionality index (FI) is needed. 

See also: