Methodological Evolution and Validity Concerns

Following the field’s early development in the 1960s, jury research became relatively dormant until a resurgence in the 1970s. During the late 1970s and 1980s, researchers increasingly relied on controlled trial simulations, which allowed investigators to examine causal mechanisms with greater precision and, importantly, to observe deliberation processes that could no longer be observed in real juries (Devine et al., 2001).

By the 1990s, work of the experimental variety had grown sufficiently large to permit comprehensive reviews and meta-analyses. Devine et al. (2001) published a 45-year review summarizing 206 studies, grouping each by focal variables: procedural characteristics, participant characteristics, case characteristics, and deliberation characteristics. Procedural characteristics encompass the structural features of the jury such as size and decision rules. Participant characteristics surround individual juror attributes such as demographics, personality traits, and attitudinal dispositions. Case characteristics concern the substantive features of the legal dispute, including evidence strength, case type, and exposure to pretrial publicity, which refers to the media coverage of a legal dispute that jurors encounter before trial. Deliberation characteristics capture the dynamics of group discussion, including the initial distribution of verdict preferences and patterns of juror interaction (Devine et al., 2001). During this period, scholarly attention increasingly turned to the functional dimension of jury behavior: how juries accomplish their decisional tasks. Devine (2012) observed that research on the civil jury, though relatively recent in origin, had developed into a comprehensive body of work examining how juries deliberate and reach collective judgments.

As jury research increasingly relied on mock juror methodologies, scholars raised sustained concerns about ecological validity. Critics argued that common design features, including undergraduate samples, written trial summaries, and abbreviated procedures, failed to capture the complexity, deliberative dynamics, and emotional stakes of real trials (Bornstein, 1999; Diamond & Levi, 1996; Vidmar & Hans, 2007). These limitations elevated concern about the generalizability of simulation findings to actual jury behavior, a critique itself generalizable across sociolegal and psychological traditions (Diamond & Levi, 1996; Vidmar & Hans, 2007). Cumulative reviews converged on patterns of juror decision-making that endure across variations in participant samples and trial presentation formats. Bornstein’s (1999) systematic review demonstrated that key effects, including the influence of evidence strength, pretrial attitudes, and legal instructions, replicate across student and nonstudent samples and across written, audio, and video media.

The COVID-19 pandemic introduced a new dimension to methodological validity concerns. Beginning in March 2020, courts across the United States suspended jury trials entirely or severely curtailed their operations, forcing the rapid adoption of remote and hybrid trial procedures that had no established evidentiary base in the jury research literature. Scholars have noted that the pandemic period created a natural experiment of sorts: virtual voir dire, remote witness testimony, and socially distanced deliberations altered the conditions of jury service in ways that existing validity frameworks were not designed to evaluate (Baldwin et al., 2020). The long-term methodological implications of this period, particularly whether findings from pre-pandemic simulation research generalize to juries operating in post-pandemic procedural environments, remain an open and consequential question for the field.