Comparison of Design-Build to Design-Bid-Build as a project delivery method
Allen, Linda N.
Angell, Joe II
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This study evaluates the difference between the Design-Bid-Build (DBB) and Design-Build (DB) project delivery methods. The project delivery method defines the acquisition process, relationships, roles and responsibilities of the project team and the sequence of events to deliver the facility. Southwest Division, Naval Facilities Engineering Command, (SWDIV), has been using both the DBB and DB project delivery methods for the past decade. The most recent four-year period has seen an increase in the use of DB project delivery. This research provides a definitive and comprehensive investigation into the comparative performance of projects delivered using these two methods. A comparison of cost, schedule and quality attributes of the two types of project delivery systems was completed using specific data from 110 military construction (MCON) projects. This study included extracting all MCON projects from the financial information system (FIS) database for the period 1990-2000. The first DB project was delivered in FY 1996, therefore the study focused on MCON projects completed from FY96-2000. All completed MCON projects were used to compare performance of all projects to the focus of this research, Bachelor Enlisted Quarters, Category Code 721. This study included interviews to verify the financial information system (FIS) data. A Survey questionnaire was distributed as the primary tool to collect data on quality performance. Several variables critical to project performance identified during interviews, survey questionnaires and data collected from FIS were also included in this study. This research should help in understanding the two project delivery methods to help an owner better select the project delivery system most suited to their specific facility goals or criteria. Results and the level of confidence that surrounds specific findings are presented. This study provides quantitative data to support the selection of a specific delivery system and increase the understanding of the two project delivery systems performance.
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