Which process involves identifying design solutions and creating prototype user interfaces?

The process that involves identifying design solutions and creating prototype user interfaces is interaction design. This aspect of user experience focuses on the way users interact with digital products, emphasizing how those interactions are designed and structured. Interaction design considers user needs and behaviors, allowing designers to create interfaces that are intuitive and efficient. Through this process, designers develop prototypes to explore ideas, test interactions, and refine those designs based on user feedback, ultimately leading to a more user-friendly end product.

In contrast, information architecture deals with organizing and structuring content, ensuring that users can find information effortlessly. Iterative design, while important, refers to the ongoing process of refining and improving designs based on user feedback and testing rather than the initial creation of prototypes. Usability testing is a method used to evaluate a product by testing it with real users, which comes after the interaction design phase has produced initial prototypes. Therefore, interaction design is the correct choice when discussing the creation of design solutions and prototypes.