This report is a technical supplement to the 36-month impact report for the Building Strong Families (BSF) evaluation (Wood et al. 2012). It provides additional detail about the research design, analytic methods, and variable construction that were used for the 36-month analysis, as well as a discussion of the subgroup analysis that was conducted. Additionally, the report discusses the treatment-on-the-treated (TOT) impact analysis, an analysis of BSF’s effects on couples who actually attended BSF group sessions. The full set of impact results generated as part of the 36-month analysis is included in the appendices of this volume. Restricted use data files and documentation are available through the Inter-University Consortium of Political and Social Research.