Since its inception 20 years ago as a public-private partnership, the Ounce of Prevention Fund (OPF) has cultivated promising ideas in early childhood development, has used private funding to test those ideas in real life settings, and has leveraged public funding to support and expand innovative programs that advance the health and well-being of children and families. This twentieth anniversary report describes the formation of the public-private partnership; outlines its mission to invest in the health and well-being of children and families through a dynamic cycle of direct service programs, advocacy, research, training, and replication; and highlights program accomplishments over the past 20 years. The report also examines the OPF's approach to serving children and families, and highlights the progress during 2002 of ideas at work in: (1) replicating the Educare Center; (2) expanding the doula network across Illinois; (3) helping families promote healthy development and early learning of their young children through the Birth to Five Project; (4) helping children develop decision making skills through the Straight from the Heart program; and (5) creating enriched learning experiences for children, families, and staff through the arts. The report continues with a statement of operating revenues and expenses and a list of donors to the organization, and concludes with a list of OPF sites and delegate agencies. (KB)