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System Condition Index (SCI)
A comparative ranking of the condition of the systems within an asset class.

The formula to derive the index, which is usually based on parametric cost estimating relationships (CERs) is:

Aggregate of the asset backlog within each system ($) / Aggregate Replacement Cost of all assets within that system ($).

One of the primary limitations of the asset condition index is the absence of a weighting system to prioritize the relative importance of the backlog associated with each asset.  
Conceptual representation of the interconnected systems in buildings
Fig. Conceptual representation of the seven primary physical systems within a building.

See also:

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