Some people swear by Save the Cat, others completely discount it. Whatever camp you might fall in, we can't discount that Blake Snyder is only an iteration of Campbell's work and almost always right on when we look at commercially successful films. I dare you to go back to some of your favorite films and see if the formula applies - to be clear we are not speaking about Art House here!
If you try to write for the big studios or commercial films, then do yourself a favor and follow this structure diagram. Furthermore, it will give you something to hold on to in those moments when you feel lost!
Screenplay Writing Lesson #4: Use Blake Snyder’s Structure
There are many versions of Campbell’s monomyth.
My favorite is Blake Snyder’s version. Snyder’s story structure diagram is easy to understand and emphasizes certain key aspects of screenplay writing.
For example, Snyder’s structure demonstrates the congruency between certain sequences of beats, e.g., it’s easy to see that Debate -> Break Into 2 is a pattern that’s repeated with Long Dark Night Of The Soul -> Break Into 3, and illustrates the importance of the Midpoint.
Does your story fit this structure – and if not, do you know why?