Designer, implementor, user, writer A Fragment by Donald Knuth dl.acm.org Thus, I came to the conclusion that the designer of a new system must not only be the implementor and the first large-scale user; the designer should also write the first user manual. The separation of any of these four components would have hurt TeX significantly. If I had not participated fully in all these activities, literally hundreds of improvements would never have been made, because I would never have thought of them or perceived why they were important. Eating your own dog food making
The iPod Suddenly everything had fallen into place: a drive that would hold a thousand songs; and interface and scroll wheel that would let you navigate a thousand songs; a FireWire connection that could sync a thousand songs in under ten minutes; and a battery that would last through a thousand songs. "We suddenly were looking at one another and saying, 'This is going to be so cool,'" Jobs recalled. "We knew how cool it was, because we knew how badly we each wanted one personally." Walter Isaacson, Steve Jobs My job is simply to design gadgets that I like