This report details the implementation of the BEST Initiative, launched in 1996 to help local communities establish comprehensive youth development programs. Youth workers at each of the evaluated sites received training based on Advancing Youth Development: A Curriculum for Training Youth Workers (AYD). AYD targets all aspects of youth development, from resources to technical support. Though the report focuses mostly on the outcome of the BEST sites, key lessons may be transferable to other youth development programs. The training institute is part of the Academy for Educational Development. 20 pages. Free online. Academy for Educational Development, 1825 Connecticut Ave., NW, 7th Fl., Washington, DC 20009. (202) 884-8334, www.nti.aed.org/ImpactStudy.html.