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 navigation is our property RENE: Tell me what we have. Of value. GAEL: Whatever we've bought in cargo so far. I don't know what you want me— RENE: Anyone can buy goods. What do we really have? What do we sell? GAEL (realizing): The route. RENE: Yes. The navigation is our property. To copy a man's route is to steal it. Shane Carruth, The Modern Ocean Into the system of flight navigationownership