1. What are the advantages of showing rough prototypes to potential customers, like those produced for Step 1 and Step 2, rather than showing them a well-developed prototype to begin with?

2. Make a list of the things the inventor of the new toaster in the feature might learn as a result of the prototyping process.

3. For the prototyping process described above, why was it necessary to go into the homes of the people who might use the device? Couldn’t similar information have been learned in a lab?

4. Do some Internet research and learn about the “Lean Startup” movement. In what ways is prototyping an essential part of the lean start-up approach?