Performance Specifications for Rapid Highway Renewal (2014) / Chapter Skim
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Pages 104-116
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104 A p p e n d i x e data Collection Approach The Delphi technique was used to assess the actual or potential value of performance specifications. The method is particularly useful when empirical means are not suitable and study results must rely heavily on the subjective opinions of experts.
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105 rounds beyond which the appropriate number of rounds is disputed (Thangaratinam and Redman 2005)
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106 Table E.1. Summary of the Participation of Agencies and Organizations in the Delphi Study Relevant Experience Data Collection Affiliation Organization or Agency Alternate Project Delivery Warranties Performance Specifications Survey Requests Survey Responses Workshop Participation (No Participants)
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107 • Life-cycle costs (LCC)
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108 Schedule The data show a general trend toward a decrease in schedule (see Figure E.4)
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109 Figure E.3. Survey data related to construction inspection and administration costs.
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110 The team began the workshop with a summary and discussion of the initial survey results. Note that for the initial survey, respondents based their answers on an actual project experience, which they described in terms of the six project characteristics identified in the survey tool (road class, location, etc.)
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111 The Round 2 Delphi survey distributed to the participants contained 32 tables similar to the one shown in Figure E.7. Each participant completed the Round 2 survey independently during the second day of the workshop.
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112 Figure E.9. Life-cycle cost comparison results under Project Combination 1.
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113 The participants were asked to consider these clarifications when completing the third round of the Delphi effort. Six of the 11 experts sent back a reply to the e-mail message with their changes, and the remaining five did not wish to make any changes to their Round 2 inputs.
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114 Figure E.15. Round 3 inspection and administration cost histogram.
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115 contractors receive incentives to manage traffic under performance criteria, shortened schedules are expected. Summary of Results The general trends derived from the Round 3 surveys concerning added or lost value are presented in Table E.3.
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116 References Corotis, R
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