Apple’s approach, by contrast, is messier and more chaotic at the beginning, but it avoids this chronic problem of good ideas being hollowed out as they progress through the development chain. Apple calls it concurrent or parallel production. All the groups—design, manufacturing, engineering, sales—meet continuously through the product-development cycle, brainstorming, trading ideas and solutions, strategizing over the most pressing issues, and generally keeping the conversation open to a diverse group of perspectives.

