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Overview 5 ect objectives and selecting the delivery method that best aligns with these objectives. The Tier 2 approach is based on successful delivery decision tools developed by academics and profession- als over the past 20 years. With the Tier 2 approach, the user concentrates on a few key param- eters that affect the choice of project delivery method, assigns appropriate weights to each parameter, and calculates a score for each competing delivery method. Organization of the Guidebook This first chapter of this guidebook provides an overview of the work accomplished and a road map for the guidebook user. Chapter 2 describes the characteristics of airport projects, presents the results of the literature search, and provides definitions of various delivery methods. Also, a summary of the existing methodologies for selection of an appropriate project delivery method is provided. In addition, recommendations are made for the appropriate point in a project lifecycle to adopt various delivery methods. Chapter 3 describes pertinent issues affecting the choice of project delivery method and the advantages/disadvantages of each project delivery method in relation to these issues. There are numerous issues that airports need to consider when deciding to select a project delivery method. In this research, issues were identified through a literature search, personal experience, case studies, and interviews with airports. Pertinent issues are categorized as follows: Project-level issues, Airport-level issues, Public policy/regulatory issues, and Other issues. These influencing issues and their interactions with different project delivery methods are pre- sented in Chapter 3 in the form of a descriptive pro-con analysis. The analysis is based on trends found in the interviews conducted by the team with directors and executives at various airports and is supported by quotations from relevant literature. Chapters 4 and 5 describe the Tier 1 and Tier 2 approaches, respectively. In order to facilitate and streamline the application of these approaches, blank versions of the tables from these chap- ters are provided in Appendices C, D, and E. The user can download these tables and go through the two tiers in sequential order (to find Appendices C through F for this report, go to www.trb.org and search for "ACRP Report 21"). Appendix A contains a list of sources that are referenced in this guidebook. Appendix B contains a glossary of important terms used in the guidebook (Appen- dices A and B can be found following the reference section of this guidebook). Appendix F pro- vides a case study example of a major airport project for which the delivery selection system was used. It is the report authors' belief that this guidebook is a comprehensive resource that can help airports select the most appropriate project delivery method and document their decision in a concise and easy-to-understand format. It is recommended that airports use outside industry pro- fessionals to facilitate implementation of the methodology contained in this guidebook. These professionals should have a thorough understanding of and experience with the type of project the airport is evaluating, the various project delivery methods the airport is considering, and the potential risks associated with the type of project and the project delivery methods under consid- eration. The use of such professionals will ensure that the appropriate expertise and experience is incorporated into the process. Facilitation of the process by outside professionals will also foster an objective selection of the most appropriate project delivery method, thereby minimizing the likelihood of a predetermined outcome.