Usefulness of comparisons using all objects over the entire time period
| Comparison for different strategy sets … | Allows statements … | Example | |
|---|---|---|---|
| 1 | … Of the total costs/risks | … Of which in general is better | The total costs/risks of strategy set 2 (€303 × 106) are lower than the total costs/risks of strategy set 1 (€1005 × 106); therefore, it is clear that one should choose the strategies with earlier preventive interventions – that is, do not neglect maintenance (Table 20) |
| 2 | … Of the costs/risks per stakeholder | … As to how each stakeholder is affected and enables discussions about trade-offs between stakeholders | The owner should be willing to execute more on later but better preventive interventions, such as renewal interventions when objects are in state 4 – that is, strategy set 1 should be followed instead of strategy set 2 – to reduce the user costs/risks (€368 × 106 against €407 × 106) (Table 20) |
| 3 | … Of the costs/risks per period of time | … As to how each stakeholder is affected and enables discussions about trade-offs between the frequency and extent of interventions of different types | The owner should be willing to spend more on earlier preventive interventions such as rehabilitation interventions when objects are in state 3 – that is, strategy set 2 should be followed instead of strategy set 1 – to reduce the risks for all stakeholders (€226 × 106 against €125 × 106) (Table 20) |
| 4 | … Of the costs/risks per object type that causes them | … As to where efforts should be focused to reduce costs | The largest sources of costs/risks are tracks (€51 × 106 if strategy set 2 is followed) and earthworks (€79 × 106 if strategy set 1 is followed and €16 × 106 if strategy set 2 is followed) (Table 21) |
| Comparison for different strategy sets … | Allows statements … | Example | |
|---|---|---|---|
| 1 | … Of the total costs/risks | … Of which in general is better | The total costs/risks of strategy set 2 (€303 × 106) are lower than the total costs/risks of strategy set 1 (€1005 × 106); therefore, it is clear that one should choose the strategies with earlier preventive interventions – that is, do not neglect maintenance ( |
| 2 | … Of the costs/risks per stakeholder | … As to how each stakeholder is affected and enables discussions about trade-offs between stakeholders | The owner should be willing to execute more on later but better preventive interventions, such as renewal interventions when objects are in state 4 – that is, strategy set 1 should be followed instead of strategy set 2 – to reduce the user costs/risks (€368 × 106 against €407 × 106) ( |
| 3 | … Of the costs/risks per period of time | … As to how each stakeholder is affected and enables discussions about trade-offs between the frequency and extent of interventions of different types | The owner should be willing to spend more on earlier preventive interventions such as rehabilitation interventions when objects are in state 3 – that is, strategy set 2 should be followed instead of strategy set 1 – to reduce the risks for all stakeholders (€226 × 106 against €125 × 106) ( |
| 4 | … Of the costs/risks per object type that causes them | … As to where efforts should be focused to reduce costs | The largest sources of costs/risks are tracks (€51 × 106 if strategy set 2 is followed) and earthworks (€79 × 106 if strategy set 1 is followed and €16 × 106 if strategy set 2 is followed) ( |
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