This article describes a comparison of the efficacy of two pregroup preparation formats for reducing drop-outs from groups for men who batter their female partners. Eighty men attending a weekly, four-session preparation group were compared with 103 men attending an intensive eight hour workshop format prior to joining open-ended, ongoing groups. The quasi-experimental comparison revealed that the intensive workshop format resulted in significantly fewer drop-outs from the ongoing group prior to completion of four sessions.