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40 A Guidebook for the Evaluation of Project Delivery Methods assume adversarial roles as one is in charge of approving the other's work. The division of responsibilities may also result in these two parties blaming each other in the case of project fail- ures or during major disputes (Halpin 2006). CMR The inclusion of the construction contractor during the design phase in the CMR method builds constructive team work and facilitates project team formation (Irwin 2003; Minchin, Thakkar, and Ellis 2007) although it requires extensive coordination of consultants and/or subcontractors. DB Having a single point of responsibility for design and construction, as in the DB method, decreases the potential for conflict between the engineer and constructor (Walewski, Gibson, and Jasper 2001; Harrington-Hughes 2002; Halpin 2006). Although in DB there should be less incentive for the designer and the constructor to blame each other for problems (since they are both on the same team and they are jointly responsible to the agency for the success of the project), instances of disputes between designer and constructor (on the same DB team) were observed during the interviews for this research [Greenbush Commuter Rail and Hudson- Bergen Light Rail]. It is worth mentioning that design-builders may be deterred from submit- ting frivolous claims to owners who have future DB projects because with a qualifications-based selection system the design-builder will want to avoid making the owner angry with a claim. DBOM With the DBOM method, the owner is less vulnerable to disputes between DB and operation and maintenance personnel. This delivery method also decreases start-up challenges and system integration during the initial years of operation (Kessler 2005). Despite this, disputes between team members such as systems and civil contractors can adversely affect the project. Conclusion This chapter discusses the advantages and disadvantages of various project delivery methods in relation to each of the pertinent issues discussed. It should be noted that in many cases, the advantages and disadvantages listed are not absolute and should be considered in comparison with competing delivery methods. The information provided in this chapter can be used to help identify the strengths or weaknesses of each delivery method in relation to important factors that can affect a project's goals. This discussion provides a broad picture of the issues affecting proj- ect delivery methods and thereby provides a basis for the decision system that is introduced in the chapters that follow.