From Executive Summary: The Office of Child Support Enforcement (OCSE) competitively awarded a cooperative agreement to the Wisconsin Department of Children and Families to procure and manage an evaluation of CSPED through an independent third-party evaluator. The Institute for Research on Poverty, University of Wisconsin, along with its partner Mathematica Policy Research, are conducting the evaluation. The evaluation’s primary aim is to test rigorously whether CSPED increases the reliability of child support payments. In addition, the evaluation will generate extensive information on how these programs operate, what they cost, and whether benefits exceed their costs. It includes a random assignment impact evaluation, an implementation study, and a benefit-cost analysis. This interim implementation report provides an early look at the first two years of CSPED, consisting of a planning year and one year of program operations.