What defines the success of a prototype during the iteration process?

User satisfaction and functional improvements are crucial indicators of a prototype's success during the iteration process. A prototype is meant to test concepts, functionality, and usability before moving into full production. If users find the prototype to be effective, intuitive, and satisfying to use, it validates that the design and functionality are on the right track.

This focus on user feedback allows designers and developers to make necessary adjustments based on real-world usage, ultimately leading to a more successful final product that better meets the needs and expectations of its target audience. The iterative nature of prototyping emphasizes refining these aspects, as the goal is to develop a product that not only functions well but also resonates with users emotionally and practically. In contrast, while factors like cost, speed, or market trends are important considerations, they do not directly gauge how well the prototype serves its intended purpose or how it will perform in the hands of users.