Pacing

A main character, with a goal, has to struggle against something that gets in the way of that goal, and wins or loses the struggle.
Libbie Hawker, in her book "Take Off Your Pants", shows that this structure is the Outline of your story. Character Arc, Theme and Pacing woven together with the Outline, now we're talking.
Pacing was the theme of this evening reading, basically the outline structure repeated - for each chapter, for each scene, funneling the reader towards the Finale. Get this part right, and they wont be able to put the book down.
Nested triangles Libbie calls it. Reminds me of the (Math alert...) fractal tree outlining of a Sierpinski Triangle

The structure of the smallest part is replicated by the larger structure, and finally by the whole structure.

Sierpinski Triangle