Some interfaces feel intuitive, while others create confusion. The key difference lies in how well a design aligns with users' mental models, which are the internal representations of how they expect a system to work. When the interface matches these expectations, actions become seamless. If not, users struggle to navigate, leading to frustration. Designers need to focus on shaping their conceptual models around what users understand, rather than the technical complexities of the system. William Hudson, a User Experience Strategist, uses Amazon’s website as a case study to illustrate the importance of a strong conceptual model. Over 20 years, Amazon has changed its visual presentation but maintained a consistent underlying model that includes familiar concepts like shopping baskets and account management. This consistency helps users feel comfortable and confident, even as the interface evolves. Hudson also contrasts user models with system models using elevators as an example. Users expect to call an elevator and select their floor inside, while some modern systems require users to select their destination at a lobby panel, which can be confusing. By understanding both perspectives, designers can improve communication with developers and ensure that the final product meets user needs effectively. The goal is to create experiences that are clear and natural, allowing users to engage with technology effortlessly.