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26 DESIGN007 MAGAZINE I JUNE 2022 Feature Interview by the I-Connect007 Editorial Team Note: is is an excerpt of an interview with Happy Holden that appeared appeared in the September 2017 issue of e PCB Design Magazine. In this interview, Happy traces the development of DFM over more than 50 years, providing a history of the post-war electronics industry as well. Happy Holden has been involved in DFM for over 45 years since he first started working at HP and optimized their PCB design and man- ufacturing processes. Naturally, for this issue, Barry Matties and Andy Shaughnessy made it a priority to get Happy's thoughts on DFM, and what true DFM entails. Andy Shaughnessy: Happy, why don't you start by telling us about your position on DFM, and why true DFM, to you means that PCB design- ers and engineers should utilize predictive engineering? Predictive Engineering: Happy Holden Discusses True DFM Happy Holden: If you use the term "predictive engineering," you're not going to get much recognition, because that's a term I use. What most people consider design for manufactur- ing, or DFM, is soware that finds errors in design. Especially in CAM tooling put out by Valor, if a manufacturer puts in his design builds in a minimum, then the DFM soware scans through that and finds what's cautionary and that all requirements are met. at's all done aer the fact. For me, DFM was introduced when HP took up DFM. It was kind of invented by Profes- sors Peter Dewhurst and Geoffrey Boothroyd. Anyway, DFM and DFMA (design for manu- facturing and assembly) were really invented by these two American professors in New England. ey wrote a book about it, Product Design for Manufacture & Assembly. It later became soware. eir whole philosophy centered on ways to figure out how to do it right the first time. eir book is about the nature of performance dur-

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