This publication is part of a series of tools and resources on financing and sustaining youth programming. These tools and resources are intended to help policymakers, program developers, and community leaders develop innovative strategies for implementing, financing, and sustaining effective programs and policies. This guide provides practical information on creating and maintaining public-private partnerships to improve and expand youth programs in states and communities nationwide. It draws from the wisdom and experiences of successful partnership leaders at the national, state, and local levels and offers guidance on existing and future partnerships. This guide defines public-private partnerships and explores why they are created and what they can do. It identifies challenges for youth program partnerships and principles key to their success. The guide shares effective strategies for establishing and sustaining partnerships based on lessons learned from successful national, state, and local models. A concluding resources section lists publications and organizations on partnerships. (Contains 11 footnotes.) [This guide was adapted from "A Guide to Successful Public-Private Partnerships for Out-of-School Time and Community School Initiatives," a publication of The Finance Project.]