Cite as: 508 U. S. 602 (1993)
Opinion of the Court
well as of assumptions. Since the methodology is a subject of technical judgment within a recognized professional discipline, it would make sense to judge the reasonableness of a method by reference to what the actuarial profession considers to be within the scope of professional acceptability in making an unfunded liability calculation. Accordingly, an employer's burden to overcome the presumption in question (by proof by a preponderance that the actuarial assumptions and methods were in the aggregate unreasonable) is simply a burden to show that the combination of methods and assumptions employed in the calculation would not have been acceptable to a reasonable actuary. In practical terms it is a burden to show something about standard actuarial practice, not about the accuracy of a predictive calculation, even though consonance with professional standards in making the calculation might justify confidence that its results are sound.
As thus understood, the presumption in question supports no due process objection. The employer merely has a burden to show that an apparently unbiased professional, whose obligations tend to moderate any claimed inclination to come down hard on withdrawing employers, has based a calculation on a combination of methods and assumptions that falls outside the range of reasonable actuarial practice. To be sure, the burden may not be so "mere" when one considers that actuarial practice has been described as more in the nature of an "actuarial art" than a science, Keith Fulton & Sons v. New England Teamsters, 762 F. 2d 1137, 1143 (CA1 1985) (en banc) (internal quotation marks omitted), and that the employer's burden covers "technical actuarial matters with respect to which there are often several equally 'correct' approaches," Committee Print 20-21.20 But since im-20 Indeed, our view of the problem of imprecision in reviewing actuarial methods and assumptions seems to have been the very reason for including the presumption in the statute. The Senate Committee Report states that "[t]he [Senate] Committee [on Labor and Human Resources] includes
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