Making physical products can be prohibitively expensive and requires careful coordination of the right people, processes and tools.  No one knows this better than Eric Lange.  As an engineer in the toy industry, he’s taken more than sixty products from various stages of development to production for retail stores like Target and Walmart.  In this episode, Eric not only defines what a prototype is, but also tells us about the one thing we need to know for successful prototyping without wasting money.