VI. Acknowledgements Understanding Uncertainty Through Simulation is the result of a decade of teaching students at both the university and executive education level. It was through their feedback that this interactive approach to explaining uncertainty evolved. It is also the result of a decade of learning and inspiration from my colleagues. Of particular value were interactions with Ben Ball, Brad Efron, Dennis Fuller, Peter Glynn, Jack Gould, Ron Howard, Dave Luenberger, Roger Myerson, Brad Osgood, William Perry, Rick Rosenthal, Richard Savage, Linus Schrage, William Sharpe, Bruce Spencer, and Arthur Veinott. Last but not least, I am indebted to Harry Markowitz both for his encouragement as well as his suggestion that I abandon my attempt to teach this stuff and go out on a street corner with a spinner and "Make Book". Christian Peccei did most of the programming of XLSim, and played a central role in its overall design. David Empey provided valuable programming assistance, while the Freeze and Thaw commands were inspired by Anton Rowe of EpiSoft. Adam Brower of Hermes Group lent his design talents to this documentation.