Which type of prototype is used when the end user is unsure of their requirements?

The correct answer is the Requirements Prototype. This type of prototype is specifically developed to help clarify and gather requirements from end users who may not have a clear understanding of what they want. By creating a mock-up or a scaled-down version of the system, stakeholders can interact with the prototype and provide feedback, allowing developers to gather essential requirements and refine them based on real user input.

This iterative process enables users to visualize the system's potential and specify what features are necessary. The Requirements Prototype serves as a communication tool, helping both developers and users align their understanding of the project goals. It encourages users to explore different functionalities and express their needs, which can be particularly useful when they are uncertain about their exact needs.

In contrast, other types of prototypes serve different purposes. For instance, an Evolutionary Prototype is designed to evolve through iterations as user feedback is incorporated over time. A Throwaway Prototype, on the other hand, is used to explore ideas quickly but is not meant to be developed into the final product. Lastly, a Functional Prototype emphasizes demonstrating specific functionalities without necessarily focusing on gathering broad requirements. These distinctions highlight the unique role that the Requirements Prototype plays in requirement gathering and clarification during the development process.