Practices for Establishing Contract Completion Dates for Highway Projects (2017) / Chapter Skim
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Pages 12-21
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From page 12... ...
12 GENERAL CHARACTERISTICS OF THE CURRENT TOOLS To collect state-of-the-practice information, a web-based survey was distributed to the voting members on the AASHTO Subcommittee on Design. Respondents from 41 state departments of transportation (DOTs)
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13 Purchased off the shelf 11% Custom developed 53% Purchased off the shelf and then customized 11% Other 25% FIGURE 5 Source of the current contract duration estimating tools. Design 42% Procurement 4% Construcon 25% Other please specify 29% FIGURE 6 Division that performs contract duration estimates.
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14 pointed out that different procedures might be used depending on the size and complexity of a project. Twelve (12)
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15 0 0 3 4 5 6 6 10 11 14 14 16 16 0 2 4 6 8 10 12 14 16 18 Cost/Value Loaded Methods Unsure Equations to Estimate Project Durations (potentially regression based) Critical Path Method-using static logic Intelligent Production Rates (e.g., adjusted for location, project scale)
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16 given if or when lettings are delayed. This may indicate the need to emphasize contract time reviews and revisions when letting delays occur.
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17 "Lane Rental," "Cost-Plus-Time Bidding," and "Incentives/Disincentives," and the most frequently selected option (23 of 28 respondents) was "Incentives/Disincentives" (Figure 12)
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18 Another survey participant stated that contractors' schedule performance was evaluated by comparing actual contract time against the original estimate; however, the evaluation results were not reported back to those who conducted the estimate. Therefore, schedule deviation from the original estimate was not used to evaluate the accuracy of the estimating procedure.
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19 between 0% and 25%, seven that the percentage difference was between 50% and 100%, and one that the percentage difference was between 25% and 50%. In general, the responses show that at many STAs the current estimating tools are not predicting contract times with acceptable accuracy.
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20 official procedures for the three delivery methods. Most of the participating states (27 of 28)
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21 Low response rates for alternative delivery methods likely suggest that even at STAs where projects with alternative delivery methods are handled differently than traditional design-bid-build projects, the official documented contract times estimating procedures are still tailored to fit the design-bidbuild delivery method. The procedures for alternative delivery methods may not be well-established or well-documented; therefore, it is difficult for respondents to specify exactly where the differences lie.
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