This paper addresses methods used in the community to predict the level of verification and validation (V&V) resources required for various levels of model and simulation (M&S) credibility. We discuss several approaches to predicting V&V resource requirements. In addition, we present a number of case studies based on the experiences of programs which needed to accredit M&S for their use; these case studies provide background on the cost and schedule impact of V&V activities and accreditation requirements. Finally, we draw some conclusions about the ability of the community to predict and plan for V&V resource requirements, and we make some recommendations for future research in this area.
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