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
My job is simply to design gadgets that I like Inventors are people who not only curse, but who also start to think of what can be done to eliminate the bother...When I see something that I don't like, I try to invent a way around it. My job is simply to design gadgets that I like. Jacob Rabinow, The Evolution of Useful Things The iPodYou and your user are one innovation