When you have long product cycles or you’re building big physical things–or both–you typically face significant risk, as a lot can go wrong between drawing board and customers. In theory, Lean Startup methods help you reduce that risk. But it’s not always obvious how you can apply them. Cory Nelson, Sr. Executive Product Manager at GE Distributed Power, talks with Eric Ries about how GE has used Lean Startup methods to develop a new diesel engine more quickly and with less risk than it had for similar products in the past.