With support from The Wallace Foundation, nine cities across the country are participating in the Next Generation Afterschool System-Building Initiative, a multi-year effort to strengthen the systems that support access to and participation in high-quality afterschool programs for low-income youth. The nine cities were selected in part because they already had a solid foundation for an afterschool system that included strong city leadership and mayoral commitment. This interim report documents how these cities used data to inform and improve their afterschool systems over a two-year period from 2012 through 2014. (author abstract)