Estimating Highway Preconstruction Services Costs - Volume 1: Guidebook (2016) / Chapter Skim
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Pages 12-19
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12 2.1 Introduction Preconstruction service activities typically take a long period of time (sometimes more than a decade) from planning to programming to preliminary design to final design.
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PCS Cost-Estimating Process 13 Figure 2.1. PCS cost estimating over the project development process.
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14 Estimating Highway Preconstruction Services Costs The PCS cost-estimating process discussed in this chapter incorporates these distinctive features of PCS cost estimating. The process involves two different estimating approaches -- top-down and bottom-up estimating -- to meet the different needs of transportation agencies at different points in the project development process.
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PCS Cost-Estimating Process 15 as major predictive parameters to estimate the anticipated cost of PCS activities. Thus, this PCS estimating is called top-down estimating.
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16 Estimating Highway Preconstruction Services Costs hand, a bottom-up approach involves a greater level of detail and facilitates decision making at a functional level regarding budgeting, scheduling, and allocating resources. Table 2.1 shows a comparison between the top-down and bottom-up approaches.
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PCS Cost-Estimating Process 17 level, but using different prediction factors for each work package in the WBS. Functional-level estimates are discussed further in Chapter 5.
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18 Estimating Highway Preconstruction Services Costs • Step I: Requirements Analysis. This step determines potential model usage and users as well as anticipated data requirements.
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PCS Cost-Estimating Process 19 required efforts and costs for a series of laboratory tests, in order to perform a cost estimate of preconstruction geotechnical activities. • Step III: Identify Factors Affecting PCS Costs.
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