In 2002, the Centers for Disease Control and Prevention (CDC) funded RTI International to identify programs designed to prevent first-time male perpetration of sexual violence and to provide&evaluation assistance to a subset of these programs. RTI conducted an environmental scan to identify programs in the relatively new field of prevention of first-time perpetration of sexual violence. The current report provides updated information on 23 of the original 37 programs and adds information on 36 new programs that have been developed since the 2003 report. This report offers a catalogue of programs targeting prevention of first-time male perpetration of sexual violence.