Batterer intervention programs were originally established in the late 1970s as feminists and others called attention to the victimization of women through domestic violence, grassroots programs sprang up, and service providers recognized that the offenders' behavior needed to be addressed. The requirement that batterers attend intervention programs as a condition of probation or as part of pretrial or diversion is fast becoming a part of the response to domestic violence in many jurisdictions. However, judges and probation officers often lack basic information about program goals and methods. This report, Batterer Programs: What Criminal Justice Agencies Need to Know, is a summary of the full-length study and attempts to meet that need by presenting information about batterer intervention programs operating throughout the country. The interventions described were selected to represent the range of programming available and include the established or "mainstream" programs as well as innovative approaches.