The following two studies describe and analyze the same case: The Phoenix-GoodyearAirport (PGA.) Superfund Site.A mini-trial was used to resolve the relative responsibility of PotentiallyResponsible Parties (PRP's): theDepartment of Defense (DOD) andGoodyear Ti-e and RubberCompany. The case could prove to be an important illustration of how ADR generally and the mini-trial specifically could apply to Superfund clean-ups.