OCI Types and Calculations
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The Overall Condition Index (OCI) is a number between 100 and 0 which represents the condition of an asset, 100 being the best and 0 being the worst. The minimum condition is used to calculate the asset’s failure point. Tracking the condition of your assets provides data to help make decisions about things like:
 budget creation and justification
 project planning
 equipment replacement
 inspection schedules
 preventative maintenance plans.
Inspections should have data for every condition category with weights, impacts, and a performance curve.
Types
There are two types of OCI calculations—Estimated and Inspected.
Estimated OCI
The estimated OCI for an asset is calculated by taking into account the asset's age, predicted performance, and inspections and tasks performed on the asset. Using this data, the estimated OCI for the asset is determined. Click here for an example.
For assets that do not have an install or replaced date, the oldest completed inspection is used to determine the asset's age.
For the most accurate calculations, we recommend assets have as many of these options as possible in place:
 Install, replace, or inspection date
 Fall into a prediction group
 Set a weight, impacts, and performance curve on each condition category library.
Inspected OCI
During an inspection, a field worker performs an assessment of an asset's condition, which is used to calculate the Inspected OCI. The inspected OCI is a weighted average of the inspection's condition category indexes. Tasks with an Inspect type activity contain an inspection record. When the inspection is complete, the Inspected OCI is calculated for the date of the inspection. It is a best practice to fill out an index for every condition category on an inspection.
Calculation Details
The Weight, or relative importance of an Index, is stored in the Condition Category library. The OCI is the result of dividing the sum of the weighted condition category indexes by the sum of the weights used.
Condition Category 
Weight 
Index 
Result 

Aesthetics 
2 x 
40 
80 
Structures 
5 x 
60 
300 
Surface 
3 x 
40 
120 




Weighted Sum Total 
10 
Results Total 
500/10 
OCI = 
500/10 
Total OCI is 
50 
Use higher weight values to increase the relative importance of a Condition Category when calculating OCI. Use lower weight values to decrease the relative importance of a Condition Category when calculating OCI. Null or zero values in Index or Weight have special effects on OCI.
If the Index is 
If the Weight is 
Effect on OCI 

NI(Not inspected) 
a number 
Estimated index for Condition Category used to calculate OCI. If unavailable estimate, Condition Category is not used to calculate OCI. 
0 
a number 
Index of 0 used to calculated OCI 
a number 
NULL 
Condition Category not used to calculate OCI 
a number 
0 
Condition Category not used to calculate OCI 
Once the OCI is calculated, the value is used to look up the corresponding Overall Condition Rating (OCR) stored in the Condition Categories Ratings library.