The intricacies of opinion assignment within the U.S. Supreme Court present an engaging puzzle for legal analysts and insiders as they attempt to anticipate the authors of pending opinions. This prediction exercise is grounded in the tradition that each justice is generally assigned an equitable number of majority opinions across the Court’s oral argument sittings. Recent research sheds light on this internal norm, tracing its evolution through different eras of the Court’s history and elucidating the factors that contribute to any departures from it.
Legal scholars like Elliot Slotnick initially explored what he termed an “equality principle” in opinion assignments, examining practices under Chief Justices from William Howard Taft to Warren Burger. This principle is frequently observed under Chief Justice John Roberts, where there has been a marked shift towards maintaining balance in opinion distribution, fostering an environment where each justice often authors an approximately equal number of majority opinions within term sittings.
Statistics support this trend. From the 2005-06 term under Chief Justice Roberts, around 59% of argument sittings concluded with each justice having authored one majority opinion, a significant rise from the preceding era, where this was true for just 17.4%, as noted by recent analysis. The decrease in the total number of cases heard may partly enable this equilibrium.
Justice Amy Coney Barrett’s tenure has seen only a slight decline in this norm’s consistency. Despite ideological shifts within the Court, the practical pattern of distributing the majority-writing workload equitably has largely persisted. Scholars suggest that the predictability within the Roberts Court reflects effective institutional management, even amid contentious and high-stakes rulings.
Nonetheless, deviations from this sitting-level equality can offer deeper insights. These might result from several factors: variations in majority participation, the chief justice’s presence or absence in the majority, strategic assignments within close or crucial cases, or the specific preferences of the assigning justice at the time. Notably, when Chief Justice Roberts does not assign opinions—a rare occurrence—it often flags cases of unique ideological or coalitional nuances.
For legal professionals, understanding the dynamics of opinion assignment offers a lens into the Court’s internal operations and how these might influence its judicial outputs. The pattern signifies more than mere procedural order—it represents the evolving political, ideological, and practical considerations shaping America’s highest court.