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Advantages and Disadvantages of Each Project Delivery Method 39 be successful on the current contract in order to be competitive for future projects. The QBS process may reduce the possibility of hiring litigious contractors. DB Analysis of the interviews conducted for this study shows that the DB delivery method is less prone to claims and disputes, assuming a well-structured contract. For example, claims for design errors, a major source of DBB contractors' complaints, are reduced considerably in DB. At the same time, early pricing leaves the owner vulnerable to claims for scope that was missing in RFP. The QBS methodology creates an effective deterrent to initiating claims by requiring the design-builder to be successful on the current contract in order to be competitive for future projects. It has also been shown that the size and frequency of change orders are smaller in DB projects (Riley et al. 2005). Other Issue Summary This section covers two important issues not directly addressed in other sections. Both of these issues concern relations among parties involved in a project. Construction claims and adversar- ial relations can hamper project success and shift the owner's focus from project success and qual- ity to dispute resolution. Conclusion The analysis done in this chapter is not deterministic. It only describes the advantages and dis- advantages of delivery methods in relation to each of the pertinent issues discussed, based on material found in the literature or information gathered during airport interviews. This descrip- tion, in turn, can be used to help identify the strengths or weaknesses of each delivery method in relation to important factors that can affect project goals. This analysis provides a broad picture of the issues affecting project delivery methods and develops a basis for the decision system that is introduced in the chapters that follow.