In this episode of DARPA’s podcast series, Voices from DARPA, join program manager Fariba Fahroo of the Agency’s Defense Sciences Office as she discusses how important mathematics can be for, in her words, “keeping our models honest.” By characterizing the uncertainties inherent in the computer models and algorithms we develop to better understand complex phenomena, such as the flow of air over aircraft surfaces and through engines, as well as to design, engineer, and control today’s ever more complicated civilian and military systems, Fahroo tells us how she aims to cultivate modeling frameworks within which these systems can be built and deployed with unprecedented degrees of confidence and insight into their strengths and vulnerabilities.