Which term describes the usability of products for the widest range of users?

The term that best describes the usability of products for the widest range of users is accessibility. Accessibility focuses on ensuring that products, services, and environments can be used by all people, including those with disabilities. It emphasizes the importance of making information and interfaces comprehensible, navigable, and operable for everyone, regardless of their physical abilities, learning styles, or other factors that might affect their interaction with the product.

By prioritizing accessibility, designers and developers create more inclusive products that embrace diverse user needs, which ultimately enhances the usability and experience for all users. This commitment to accessibility is crucial for meeting legal requirements, as well as for fostering a positive user experience that allows everyone to participate equally in digital environments.

In contrast, usability testing focuses specifically on evaluating how easy and efficient a product is for users but doesn't encompass the broader notion of inclusivity. User-centered design emphasizes designing products based on the needs and preferences of users but can sometimes overlook accessibility considerations. Interaction design pertains to the design of interactions between users and products but does not directly address usability across a broad spectrum of users.