Lack of money has long kept promising preventive programs from expanding. Existing government-funded programs are furthermore subject to budgetary cutbacks or complete loss of funding. Moreover, preventive programs traditionally offer no accountability for success or failure. This leaves government entities in a bind where if they invest their limited funding in preventive programs that turn out to be ineffective, they end up paying for both the ineffective program and the services the program was intended to prevent. Social Impact Bonds (SIBs) aim to combat chronic underinvestment in preventive programs while promoting increased accountability. This report details the structure of the New York City SIB and the program that it finances, the Adolescent Behavioral Learning Experience (ABLE). An appendix presents: Major Stakeholders in the New York City SIB Deal.