Which of the following is NOT a benefit of using prototypes?

The choice indicating that defining project timelines is not a benefit of using prototypes is correct because prototypes primarily serve the purpose of testing concepts, gathering user feedback, and visualizing the design. While they can inform project timelines indirectly by allowing teams to understand the complexities involved in development or by clarifying requirements through user feedback, the defining of timelines is not a direct advantage of creating prototypes.

In contrast, prototypes are incredibly valuable for providing a visual representation of the final product, which helps stakeholders and team members understand how the end product will look and function. They also make debugging easier by allowing developers to identify problems early in the design process and iterate on the design based on user interactions. Additionally, user feedback is a crucial aspect of working with prototypes, as these early models allow users to engage with the ideas and contribute insights before full-scale development begins.