The one-sentence chapter test
Before you draft a chapter, write one sentence: "By the end of this chapter, the reader must know / feel / believe X." Not a plot summary. Not what happens. What must be true in the reader's mind when the last line lands.
If you can't write that sentence, the chapter isn't ready to be written. You're missing a reason for it to exist — and everything that follows a missing reason is scaffolding dressed as story.
The test works in revision too. If you finish a draft and can't write the sentence looking back, find the sentence it should have had, then rewrite toward it.
❝Every chapter is either load-bearing or it isn't. There is no comfortable in-between.
— Rook