Jackson v. Unocal Corp

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The issue on appeal to the Supreme Court in this case pertained to the standards a trial court applies when it decides whether to certify a class pursuant to C.R.C.P. 23. The Supreme Court reversed the court of appeals' rulings: that the trial court must apply a "preponderance of the evidence" standard to C.R.C.P. 23's requirements, that the trial court must resolve factual or legal disputes dispositive of class certification regardless of any overlap with the merits, and that the trial court must resolve expert disputes regardless of any overlap with the merits. The Court also concluded that the trial court rigorously analyzed the evidence in determining that Plaintiffs in this case established an identifiable class and satisfied C.R.C.P. 23(b)(3)'s "predominance" requirement.