I write in a pretty straightforward way. I kind of sit down at page one and start writing.
In the Making Of book ["300"] there's a guy named Victor Davis Hanson who is a a frickin genius. He's a Greek historian and we showed him the movie because I wanted him to write a forward to the Making Of book. I was a little nervous to be honest, because I wasn't sure how he'd react.
[Writing something original from scratch], the initial process is way different. But once it exists and you start to actually work on making it real, then the approach is kind of the same, for me anyways.