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
Architectural screenplays Tschumi began to explore this notion through what he called screenplays: each “screenplay” was a black-and-white diagram breaking down a range of events that might occur inside an architectural space. Tschumi drew them in a way that resembled dance notation or the spatial analysis of a film scene. Geoff Manaugh, A Burglar's Guide to the City Architectural sequences