Since 1996, the Annenberg Public Policy Center (APPC) has tracked and reported the availability and the quality of programming specifically designed for children. This report evaluates the availability and quality of children's programming in the 1998-99 season and examines factors that may have influenced the quality and quantity of programming. The first part reviews a decade of significant changes in children's television and the influence of those changes on the current state of programming, including the regulatory environment, economic environment, industry structure, and internal constraints. An analysis of the current state of children's programming in the Philadelphia market is presented in the second part. Factors examined include venue, time, audience, educational content, character diversity, violence, language, sexual innuendo/provocative dress, and quality. The third part summarizes the findings and discusses the implications of this research for children's television in the next millennium. Appendices include a table of APPC high quality programs, intercoder reliability coefficients, programming venues, and an outline of programming features for children of different ages. (Contains 38 references and 38 endnotes.) (AEF)