At Duo Security, we know usable systems are not only more satisfying to use, but they’re more secure because people are more likely to use them. Over the past year, the product design team has made usability testing a central element of our design process. Every two weeks, we conduct moderated, remote testing sessions with users who try our interfaces while telling us what they’re thinking. Where they struggle, we likely need further iteration. Where they accomplish tasks with ease, that’s a sign of good usability. Building an in-house usability testing program has involved a lot of resources, but the results are worth it.