In November 2017, Tom Evans gave a webinar titled "Managing Defects in HPC Software Development" in the series Best Practices for HPC Software Developers. In this article, Tom summarizes how the strategies he employs have helped his teams deliver better science. Tom is a scientist at Oak Ridge National Laboratory; he leads the project "Coupled Monte Carlo Neutronics and Fluid Flow Simulation of Small Modular Reactors," part of the DOE Exascale Computing Project.