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
The top-down method has the following general attributes:
Some of the advantages of the bottom-up method may be summarized as follows:
- Greater accuracy in the 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
are not included in the backlog
calculation. This can be partially
addressed by including a contingency for unknowns.
- It is
difficult to attach repair costs to disparate deficiencies, some of
which are best bundled
together into projects
rather than being done piecemeal.
The bottom-up method is often best suited to
Fig. Field data
collection by the
engineering team in order to derive empirical data.
Fig. The three
formulas and key performance
indicators (KPI) used to measure and evaluate the physical health of a