Henry W. Stoll is professor emeritus of mechanical engineering at Northwestern University, Evanston, Illinois. He has extensive industrial experience in mechanical engineering design and design for manufacture and consults widely with industry. Before retiring from full-time teaching in 2008, Professor Stoll taught product design, mechanical systems design, and manufacturing for many years. Dr. Stoll is the author of two books and several book chapters on design for manufacture and structured design methods. He has presented more than 100 on-site design for manufacture, quality by design, and