Figure 3 : The performance matrix for sustainment of a fleet of locomotives
Performance Levels
The level of performance contractually required to be achieved by a contractor for each performance measure must be made clear in a PMF . For KPIs which are quantitative , the required level is determined either top-down i . e by referring to official documents that state the expected performance of the system ; or bottom-up i . e based on historical data , mathematical prediction or professional judgement . An example of performance levels assigned to a set of three KPIs is as follows :
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KPI-1 Availability : average 85 % of fleet available at 8am per month
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KPI-2 Reliability : maximum 5x failures per month
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KPI-3 Maintainability : maximum 5 days maintenance delay per month
It is important to ensure that the calculations for all measures are foolproof to avoid misinterpretation . As an example , for KPI-1 above , let us assume availability data includes
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where ; here ;
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=
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tive the actual importance state of of the a fleet KPIs of , appropriate 15 locomotives weig
monitored on a 24-hour basis . The Monthly Fleet Availability average , which is the actual measure of performance for KPI-1 , is equal to the fleet ’ s Daily Achieved Availability divided by the number of days in the month , as calculated in the above formula .
Depending on the relative importance of the KPIs , appropriate weightage is assigned to each KPI . In the above example , if KPI-1 is twice as important as KPI-2 and yet , KPI-2 is also twice as important as KPI-3 , the assigned weightages of the KPIs will normally be 50 %, 30 % and 20 % respectively . Assignment of relative weightages
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