Eighty-three couples were stratified into groups at high and low risk for relationship distress and randomized to either the Self-Regulatory Prevention and Relationship Enhancement Program (Self-PREP) or a control condition. As predicted, there were differential effects of Self-PREP on high-risk and low-risk couples. Because of low statistical power, results must be interpreted cautiously, but at 1-year follow-up high-risk couples in Self-PREP showed trends toward better communication than control couples. However, there was no difference in the communication of Self-PREP and control low-risk couples. High-risk couples receiving Self-PREP exhibited higher relationship satisfaction at 4 years than control couples, but in low-risk couples relationship satisfaction was higher in the control condition. High-risk couples seemed to benefit from skills-based relationship education, but low-risk couples did not.Couples who sustain mutually satisfying relationships experience many benefits. Relative to other people, those in satisfying marriages have lower rates of psychological distress, higher rated life happiness, and greater resistance to the detrimental effects of negative life events (Bradbury, 1998;Gore, 1978;Gove, Hughes, & Style, 1983;Halford, 2001;Halford, Kelly, & Markman, 1997). In contrast, being in a distressed marriage is a generic risk factor for poorer mental and physical health for the couple and their offspring (Coie et al., 1993;Halford, 1999) and is strongly associated with risk for relationship aggression (Arias, Samios, & O'Leary, 1987;O'Leary et al., 1989).Almost all couples report high relationship satisfaction at the time of marriage, but for many couples satisfaction erodes in the first few years of marriage (Hill & Peplau, 1998;Huston & Vangelisti, 1991;Kurdeck, 1998;Markman, 1981;Noller & Feeney, 1994;Veroff, Douvan, Orbuch, & Acitelli, 1998). Decreased satisfaction is associated with a high risk of separation (Gottman, 1993), particularly if there is physical aggression between the partners (Rogge & Bradbury, 1999). About 42% of Australian marriages end in divorce (McDonald, 1995), and about half of these divorces occur in the first 7 years of marriage (McDonald, 1995).Across the United States, Western Europe, and Australia, relationship education programs are widely available to marrying couples (Halford, 1999;Simons, Harris, & Willis, 1994;van Widenfelt, Markman, Guerney, Behrens, & Hosman, 1997). These programs are intended to assist couples in sustaining satisfying marriages and to reduce divorce rates (van Widenfelt et al., 1997). Most relationship education programs are offered by religious and community groups, the content of these programs is often not documented, and the effects of most of the programs have not been evaluated (Halford, 1999;van Widenfelt et al., 1997). Relationship education programs that have been evaluated empirically involve a substantial focus on training couple communication skills (Halford, 1999). For example, the Minnesota Couples Communication Projec...