Common Issues vs. Individual Issues Bifurcation

Common issues versus individual issues bifurcation is a trial management technique, available to transferee courts under Federal Rule of Civil Procedure 42(b), in which a mass tort trial is divided into separate phases that first resolve questions common to some or all plaintiffs — such as general causation, whether the defendant's conduct was negligent or the product defective, or whether punitive conduct occurred — before proceeding to a second phase addressing questions that vary by individual plaintiff, such as specific causation and compensatory damages. Bifurcation is intended to promote efficiency by resolving docket-wide questions once rather than relitigating identical evidence in every individual trial, and a common-issues verdict favorable to plaintiffs can then be applied, subject to issue preclusion principles, across some or all of the remaining individual cases without requiring the common evidence to be retried. Bifurcation is not without controversy: defendants frequently argue that separating liability-related common issues from individual causation and damages issues risks juror confusion and can prejudice the defense by allowing a punitive or liability finding to be reached in the abstract. Some jurisdictions and some transferee judges decline to bifurcate mass tort trials for these reasons, preferring instead to try each bellwether case as a complete, self-contained proceeding.

Where a transferee court adopts bifurcation, a plaintiff-favorable common-issues verdict functions as a docket-wide value inflection point similar in magnitude to a favorable Daubert ruling, since it can be applied across the remaining individual cases and substantially increase settlement pressure without requiring full individual retrials.

Funders should identify early whether a docket's trial plan contemplates bifurcation, because it changes the shape of the underwriting timeline — concentrating risk and potential upside into a single common-issues trial rather than spreading it evenly across a sequence of complete bellwether trials.