We discussed different levels of prototype fidelity from low to high. Low-fidelity prototypes like paper sketches require more user input but less work from designers. High-fidelity prototypes look closer to the final product but require less user input. He emphasized testing prototypes with users early and often to incorporate their feedback. Rapid application development can generate working prototypes even without complete backend logic, using a "Wizard of Oz" approach to simulate interactions. The overall goal is to get user feedback at various stages of the design process through prototyping.

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