Title Cost Performance Comparison of Project Delivery Methods in Pubicl Sector - Focusing on Mediator Effect of Biddropping on Change Orders -
Authors Moon, Hyosoo ; Lee, Hyun-Soo ; Park, Moonseo ; Lee, Bogyeong ; Joo, Seonu ; Son, Bosik
DOI http://dx.doi.org/10.6106/KJCEM.2015.16.5.086
Page pp.86-96
ISSN 2005-6095
Keywords Mediator Effect of Biddropping ; Delivery Method ; Design-Bid & Design-Bid-Build ; Cost Performance ; Change Order
Abstract According to previous research, the reason why Design-Build(hereinafter “DB”) outperforms Design-Bid-Build(hereinafter “DBB”) in terms of cost is due to less change orders(hereinafter “COs”). However ; if biddropping was low for DBB resulting into increasing COs ; then it would be wrong to conclude that DB is superior due to less COs. Therefore ; in order to confirm such misjudgment ; the attempt to comprehensively analyze biddropping ; COs and delivery method was made as previous methods had analyzed either the relationship between delivery method and COs ; or biddropping and COs. This research uses path analysis ; which simultaneously compares effect sizes on COs according to delivery method and biddropping based on the project type ; and validated the mediator effect. The research proved that DB outperforms DBB due to less COs cannot be validated as biddropping caused a mediator effect by intervening between the delivery method and COs for specific project types. Therefore ; the mechanism of delivery method acts on COs through biddropping was established. Also ; the identity of biddropping was investigated in a different perspective from previous research. Based on this result ; this research is expected to help determine a delivery method by considering the mediator effect of specific projects and evaluate performance.