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The strategy The strategy analysis method uses the same components as multi-constraint analysis with the following exceptions:
- It optimizes over the entire analysis period rather than a year at a time.
- In order to do that, the input into the integer programming engine is present value costs and strategy benefit/condition formulations derived from strategy alternative rehabilitation strategies. For every road section you supply as input several life cycle rehabilitation strategies (using the Strategy Configuration and Section Strategies windows). The present value cost and strategy and strategy benefit/condition calculations for each road section and strategy is then used as the input into the integer programming optimization engine. The result is selection of the best life cycle strategy per road section.
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- Use of decision trees (but, for strategy analyses, in the strategy input phase rather than during analysis). Also, while INCBEN decision trees can be used in strategy analyses, only the first recommended treatment of each decision tree limb will be used and the other two treatment options will be ignored.
- Use of deterioration (but, for strategy for strategy analyses, in the strategy input phase rather than during analysis).
- Integer programming engine.
- The same options for objective function and constraints (but, in strategy analyses, applied to the entire rehabilitation life cycle rather a specific rehabilitation recommended for a section in a given year).
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| Note: For typical strategy analyses, every section must have a "no improvement" strategy because the engine must assign a strategy to every road section. If this strategy is missing, then in rehabilitating all sections costs are generated that violate constraints and so result in "no solution." |
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The strategy The Strategy with Work Plan type of analysis is essentially the same as the strategy type of analysis. The difference is that the strategy with Work Plan only uses the treatments defined in the master work plan rather than pre-calculating the treatments as with the strategy type of analysis. The result of the strategy with Work Plan type of analysis is the projects and treatments that satisfy the constraints of the analysis.
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