In the Prototype Test, you will finally start to build something, but not all at once. Instead, you will transform your virtual prototype into an inexpensive physical prototype that you can use to test your solution face-to-face with customers. Now that customers have reacted positively to your concept, it's time to see how they will react to the details of an actual prototype. Looking at the table below, we see that the actual prototype should provide some functionality and allow customers to touch, feel, and navigate the product.
(See Nail It Then Scale It, pg. 116)