What should a prototype have according to the design process?

A prototype should have a clear goal related to product functions because it serves as the tangible representation of ideas that help in testing and validating design concepts. Defining a clear goal ensures that the prototype focuses on specific user needs and functionalities, guiding both designers and stakeholders throughout the iterative design process.

Having a defined goal allows designers to test hypotheses about how users interact with the product, providing insight into functionality and usability. This is crucial for refining designs based on user feedback, ultimately leading to a more effective and user-centered final product.

In contrast, while a detailed market analysis and a comprehensive user manual can be important in the broader context of product development, they are not essential components of a prototype. Moreover, a visual design mock-up may assist in illustrating aesthetics but does not directly contribute to the prototype's functional intent.