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
251. Different Chairs Problem People are different sizes; they sit in different ways. And yet there is a tendency in modern times to make all chairs alike. Solution Never furnish any place with chairs that are identically the same. Choose a variety of different chairs, some big, some small, some softer than others, some rockers, some very old, some new, with arms, without arms, some wicker, some wood, some cloth. Christopher Alexander, Murray Silverstein & Sara Ishikawa, A Pattern Language Drawing pictures of citiesAn index of the shifting patterns furniture