This study was an outcome evaluation of the effects of the Duluth Domestic Abuse Intervention Project Training Model for Law Enforcement Response on police officer attitudes toward domestic violence. Data on the effectiveness of the training were collected by means of an attitude survey of law enforcement officers (Part 1). Additionally, two experimental designs (Part 2) were implemented to test the effects of the Duluth model training on (1) time spent by police officers at the scene of a domestic violence incident, and (2) the number of convictions. Variables for Part 1 include the assigned research group and respondents' level of agreement with various statements, such as: alcohol is the primary cause of family violence, men are more likely than women to be aggressive, only mentally ill people batter their families, mandatory arrest of offenders is the best way to reduce repeat episodes of violence, family violence is a private matter, law enforcement policies are ineffective for preventing family violence, children of single-parent, female-headed families are abused more than children of dual-parent households, and prosecution of an offender is unlikely regardless of how well a victim cooperates. Index scores calculated from groupings of various variables are included as well as whether the respondent found training interesting, relevant, well-organized, and useful. Demographic variables for each respondent include race, gender, age, and assignment and position in the police department. Variables for Part 2 include whether the domestic violence case occurred before or after training, to which test group the case belongs, the amount of time in minutes spent on the domestic violence scene, and whether the case resulted in a conviction.