To ensure that young people and adults acquire the skills they need to render them employable, vocational education and training systems around the world construct various forms of collaboration between the public and private sectors. Public-private partnerships that focus on skills development are one form of collaboration in the provision of vocational education. Building on evidence from 23 case studies, this report provides an overview of these public-private partnerships; it clarifies what they are and how they function, and examines the conditions necessary for their formation and sustainability, as well as the risks they entail and their potential for success. [For "Public-Private Partnerships for Skills Development: A Governance Perspective. Volume II. Case Studies," see ED610847.]