SANDIA REPORT SAND2006-5557 Unlimited Release Printed October 2006 A Sampling-Based Computational Strategy for the Representation of Epistemic Uncertainty in Model Predictions with Evidence Theory J.C. Helton, J.D. Johnson, W.L. Oberkampf, C.B. Storlie Pr epared by Sandia National Laboratories Albu querqu e, New Mexico 87185 and Liver more , Ca liforn ia 94550 Sandia is a multiprogram laboratory operated by Sandia Corpo ra- tion, a Lockheed Martin Compa ny, for the United States Depart ment of Energy's National Nuclear Securi ty Admi n istrati on under Contract DE-AC04-94AL85000. Approved for public release; further d issemination unlimited. (rI1) Sandia N ati onal La bor atori es