The objective of Phase III is to initiate and complete a community mobilization intervention aimed at ultimately reducing HIV incidence and prevalence among youth. The intervention will consist of guiding C2P coalitions through a strategic planning process that will result in the development and implementation of a local action plan. The action plan will focus on changing structural elements of the affected communities that are believed to be associated with youth HIV acquisition and transmission. Each coalition's plan will include: (1) identification of potential community structural changes and specific steps for how to effect such changes; and (2) the selection of a community-level Centers for Disease Control and Prevention (CDC)-endorsed HIV prevention program. These activities will be described in this document. Details related to the training, technical assistance, adaptation, and implementation of the selected CDC program will be subsequently submitted for IRB review as part two of Phase III (ATN 041).