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Bottom-Up Backlog Calculation

A method of calculating the backlog which aggregates the line-Item deficiencies for each asset to determine the amount of backlog to place in the numerator of the FCI formula. 


Attributes
The top-down method has the following general attributes:


Evaluation
Some of the advantages of the bottom-up method may be summarized as follows:

  • Greater accuracy in the data.
  • Detailed, actionable data.
  • Data is based on empirical findings.

Some of the limitations of this method are listed below: 

  • It is a time-consuming and labour intensive method.
  • An expensive means of establishing the FCI, particularly in the context of budget constraints.
  • Any missed deficiencies and concealed conditions are not included in the backlog calculation. This can be partially addressed by including a contingency for unknowns. 
  • It is extremely difficult to attach repair costs to disparate deficiencies, some of which are best bundled together into projects rather than being done piecemeal.   

Management Principles
The bottom-up method is often best suited to
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Fig. Field data collection by the engineering team in order to derive empirical data.


Facility Condition Index FCI formula
Fig. The three formulas and key performance indicators (KPI) used to measure and evaluate the physical health of a facility

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