In 1993, four Wisconsin urban counties, with the assistance of CRC, developed and implemented a new protective service case management system. This report summarizes findings from an impact evaluation. The study assessed the impact of intensive child protective services on maltreatment by comparing case outcomes of families opened for CPS intervention with those that were not opened while controlling for risk level. The results of this study clearly demonstrate that focusing intensive service intervention on high risk families significantly reduces subsequent maltreatment during a 24 moth observation period.