What's strange about the games industry is that unlike any other media that has reached the mass populous, its creative process has had a hard time evolving compared to literature, TV and film. We had silence to speech and black and white to color but that's in regards to technology. As far as the production process goes, you have to have a premise, treatment, sample script, or novel extract. All these elements give a taste of the show, film or book you're putting into production. With that, companies and agents can assess whether it's worth giving the go ahead to. This is pretty fair, that is when you don't factor in all the reality and creativity bullsh*t companies are more willing to commission these days.