The lecture on usability testing highlighted how essential it is to design with the user at the centre, reinforcing principles from Don't Make Me Think and other key texts like The UX Book and Tragic Design. What stood out most was how usability is not just about making something “easy,” but ensuring it is useful and supports real user goals. If a product doesn’t meet user needs, it has no value. The example of Jenny particularly emphasised the real-world consequences of poor UX, showing how small usability issues like unclear alerts can have serious outcomes. I also learned the importance of the five components of usability learnability, efficiency, memorability, errors, and satisfaction and how these can be measured through testing. Moving forward, I will apply this to my project by conducting early and iterative usability tests (even with a small number of users), using think-aloud protocols, and focusing on clear tasks and feedback. I will prioritise simplicity, consistency, and reducing cognitive load by using familiar patterns, clear language, and strong visual hierarchy. This lecture reinforced that usability testing is not about proving ideas right, but informing design decisions, and I will use it as an ongoing process to refine and improve my product.