Your novel's structure

My current thinking about structure - which I use both for my own novels and for working with clients' books - is influenced primarily by the three-act structure as explained to me by my friend Diane Gilman, who wrote screenplays for many years, and by Viki King's description of the nine plot points in her book How to Write a Movie in 21 Days. Influenced being the operative word; what I offer here is not a straight mash-up of those two approaches. I'm not convinced that my philosophy is complete yet, but it's a start, and I think it's worth sharing at this point.

Act I: The Beginning
This is The Beginning of your story, starting on on page 1. It introduces the novel's setting, tone, characters, and theme(s) and includes two inciting incidents: the one that happens within the first five or six pages, and the one that heralds the end of Act I, around page 50.

Yes, that's right: Act I is only 50 pages long. If that.