The great fun of doing new plays is that people have no idea what's going to happen next. That goes quite soon, as people start talking about it, and the only way you can keep hold of that is genuinely to keep changing it.
Well, there are three different processes of making a film, of course. They're sort of re-written three times. You write it to start with, and then you shoot it and you re-write it while shooting and you sort of re-write it as you edit.
At school, I decided I wanted to be a director and then I went out and spent the rest of my adult life trying to be a director. It was really clear to me. So in that sense I was very lucky.
There has been one defining production for me in each decade.