Steve Jobs talks the relationship between a great idea and a great product

Many companies get the disease of thinking that a really great idea is 90 percent of the work. And the problem with that is that there’s just a tremendous amount of craftsmanship in between a great idea and a great product. And as you evolve that great idea, it changes and grows. It never comes out like it starts because you learn a lot more as you get into the subtleties of it. And as you get into all these things, designing a product is keeping five thousand things in your brain, these concepts, and fitting them all together in new and different ways to get what you want. And every day you discover something new that is a new problem or a new opportunity to fit these things together a little differently. And it’s that process that is the magic.