Mediation and other forms of alternative dispute resolution (ADR) grew rapidly in the last few decades as a result of high divorce rates, frequent conflicts between parting parents, the resulting administrative burden on courts, and especially concerns about damaging effects on children and postdivorce family relationships. This article focuses on our longitudinal research involving randomized trials of mediation and adversary settlement to support the conclusions that mediation can: (1) settle a large percentage of cases otherwise headed for court;(2) possibly speed settlement, save money, and increase compliance with agreements; (3) clearly increase party satisfaction; and (4) most importantly, lead to remarkably improved relationships between nonresidential parents and children, as well as between divorced parents -even twelve years after dispute settlement. The key "active ingredients" of mediation are likely to include: (1) the call for parental cooperation over the long run of coparenting beyond the crisis of separation, (2) the opportunity to address underlying emotional issues (albeit briefly), (3) helping parents to establish a businesslike relationship, and (4) the avoidance of divisive negotiations at a critical time for family relationships. We call for more research on mediation and other forms of ADR, as well as a renewal of the excitement and optimism of the "first generation" of mediators, qualities that are "active ingredients" in any successful social or psychological intervention.In the last few decades, mediation and other forms of alternative dispute resolution (ADR) for disputes between divorcing, divorced, or never-married parents have spread rapidly, particularly for conflicts involving custody and other issues about children. The growth of mediation followed increasing rates of divorce in the United States and elsewhere in the industrialized world, and was motivated by a general dissatisfaction with the traditional adversary methods for settling these disputes through attorney negotiations or litigation. Advocates promised that mediation and other forms of ADR would achieve the two broad, but not always fully compatible, goals of making dispute resolution both more efficient and increasingly family friendly.Motivated by research showing that many harmful effects of divorce on children were due to exposure to and involvement in parental conflict (Emery, 1982), we embraced the promise of mediation (Emery & Wyer, 1987a) and developed a court-based custody mediation program in the mid-1980s, one of the first such programs in Virginia. Two unique features distinguished our efforts from most mediation programs. First, our objective from the beginning was to evaluate the effectiveness of mediation in comparison to adversary settlement, and, in fact, we were able to obtain random assignment to one or the other alternative, a powerful and critically important scientific control. Second, our mediation process was short-term so as to be practical for court programs, yet our mediation style also was ...