The Making of The Simpsons

The Verge - "How an episode of The Simpsons is made" 

"It was always a huge treat to see. You had no idea what George Meyer (for instance) was going to say, and suddenly it was like this fantastic Simpsonsepisode pouring out of his mouth that you never dreamed of. And it was like, wow, this is where this stuff comes from.

A lot of times people worked collaboratively, too. We would work with Conan, back and forth, and we’d exchange ideas and help polish them up. And so everybody would usually come with two, sometimes three ideas. You’d take fifteen minutes and you’d say your idea in front of everybody — all the writers, Jim Brooks, Matt Groening, Sam Simon when he was still there, and also the writers assistants who would be there taking notes on all this stuff."