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
Real artists sign their work When the design was finally locked in, Jobs called the Macintosh team together for a ceremony. "Real artists sign their work," he said. So he got out a sheet of drafting paper and a Sharpie pen and had all of them sign their names. The signatures were engraved inside each Macintosh. Walter Isaacson, Steve Jobs Signing party