Which of the following is typically included in the testing of prototypes?

The inclusion of performance evaluation and user experience feedback in the testing of prototypes is crucial for several reasons. Primarily, the goal of testing a prototype is to assess how well it meets the design specifications and user needs. Performance evaluation involves measuring how the prototype functions in real-world scenarios, ensuring reliability, durability, and efficiency. This provides direct insights on its usability, as well as the potential need for adjustments.

User experience feedback, on the other hand, captures the perceptions and reactions of actual users. Understanding how users interact with the prototype can reveal insights about its effectiveness, ergonomics, and aesthetics. This feedback is invaluable for iterative design, allowing designers to refine the product based on direct user input.

In comparison, other options such as cost analysis, marketing strategies, and material sourcing are more relevant to the later stages of product development and commercialization rather than the immediate testing of prototypes. They are important for overall project viability and strategic planning but do not directly address the practical validation of a prototype's functionality and user impact.