Home visiting is a widely supported method for delivering a vast array of preventive and early intervention services to families in need of support. However, research summarizing the effects of home visiting programs across a wide range of outcomes suggests mixed, modest findings depending on the outcomes examined (Bilukha et al., 2005; Gomby, 2005; Guterman, 1999; Howard & Brooks-Gunn, 2009; Layzer, Goodson, Bernstein, & Price, 2001; Sweet & Appelbaum, 2004). Further investigation is warranted to determine what factors are associated with the greatest likelihood of program success. This is particularly important in an environment where funding for health and human services programs is limited, budget cuts are widespread, and programs are being held more accountable for producing positive outcomes and cost savings. Therefore, a meta-analytic component analysis of home visiting programs for pregnant women and families with children birth to age three was conducted to determine which program components have the most potential to improve key parent and child outcomes. (author abstract)