The launch of Healthcare.gov in 2013 stands as a paramount example of usability failures in a high-stakes real-world scenario. Users encountered broken forms, confusing navigation, and slow loading times, making it virtually impossible to sign up for health insurance. This demonstrated a critical lack of user testing and understanding of target user needs during development. Another classic, albeit older, case is the Therac-25 radiation therapy machine, where a combination of software bugs and poor interface design led to patients receiving fatal overdoses due to misinterpretations by operators. These instances underscore how inadequate UX design can result in significant financial losses, reputational damage, and even loss of life. More details: https://x.com/MarieW84005