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An investigation of the impact of innovations in civil trial procedure manipulated trial structure (unitary vs. separated trial issues), order of decisions (liability or causation first), and number of decisions made (one to four) in a simulated toxic tort trial. Juries gave verdicts and damage awards. Recordings were made of the juries' deliberations. The results showed significantly more verdicts in favor of the plaintiffs in unitary trials (causation, liability, and damages heard together) as opposed to separated trials. However, average damage awards were higher in the separated than in the unitary trial conditions. Juries assigned more responsibility to the defendant in the unitary trial. Juries also used the totality of the evidence to decide all issues, especially general causation, which contained the most ambiguous testimony. The performance of these simulated juries in complex litigation was discussed in terms of group and individual cognitive factors.

An experiment was performed to determine the effects of the size of the plaintiff population, the presence or absence of an outlier, defined as a plaintiff whose injuries were significantly more severe than other plaintiffs, and whether plaintiffs were tried individually or were aggregated in a group. Sixty-six person juries were assigned to one of eleven experimental conditions, listened to a 4-h toxic tort trial, and, after deliberating, delivered verdicts on liability, and damage awards. The verdicts were increased significantly by the presence of an outlier and by an increase in the plaintiff population. While the punitive awards were higher in the outlier condition, there was also a tendency for juries to find the company not liable.The meaning of the above findings, as well as the fact that juries exhibited great variability in their verdicts was discussed. Evidence as to the decision-making process of the juries was also gathered and discussed.

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