TRB’s Airport Cooperative Research Program (ACRP) Web-Only Document 6: Evaluation and Selection of Airport Capital Project Delivery Methods reviews pertinent literature and research findings related to various project delivery methods for airport projects. It contains definitions of project delivery methods and discusses the existing selection approaches commonly used by airports. ACRP Web-Only Document 6 is a companion document to ACRP Report 21: Guidebook for Selecting Airport Capital Project Delivery Methods.