The document discusses paper prototyping for user interface design. It provides examples of using paper prototypes to gather early feedback, including sketches of interface designs and using paper to simulate interfaces. The benefits mentioned are getting early feedback and testing design ideas before implementing them in code. Different types of prototyping are mentioned, including paper, script-based, and visual programming prototypes.
The document contains images demonstrating how paper prototyping can be used to test a design before and after changes, and highlights the importance of understanding users and goals when prototyping.