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Stimulated by regulations and standards, as well as commercial imperatives, medical device manufacturers are striving to make medical devices safer by decreasing the potential for harmful use errors. Accordingly, manufacturers are observing and interviewing intended users about their interactions with devices en route to developing user interface requirements; applying human factors engineering (HFE) principles when designing user interfaces; and conducting formative and summative usability tests to improve and validate their devices' interactive quality. This has represented significant work for manufacturers, particularly the majority who started with little HFE knowledge and experience. The means to ensure software-user interfaces' use-safety is arguably less obvious than the blade-guard example. However, medical devices with a software-user interface, which serve critical purposes and feature sophisticated functionalities, pose a design challenge that must be met. Applying HFE and controlling use-related risk are inexorably linked. Applying HFE to medical software-user interfaces is the ultimate risk control measure that leads to specific safety enhancements, such as properly-sized text, clear procedural guidance, and deliberate mode selection.