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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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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