DFMA methodology. DFMA is a registered trademark of Boothroyd Dewhurst, Inc. Boothroyd, G., Dewhurst, P. Knight, W., Product Design for Manufacture and Assembly, 2nd Edition, Marcel Dekker, New York, 2. ReferenceseditDFMA Takes a Back to Basics Product Simplification Strategy to Cut Costs September 2. Design News magazineDFMA Hits the Jackpot July 2. Desktop Engineering magazine. Official European DFMA Site. DFMA Official Site.