A word quota forces a decision a hard deadline doesn't

Why a quota beats a deadline

A number forces a decision about what belongs in the chapter, and that decision is cheaper to make before drafting than after. Keep chapters short enough to draft in one sitting too, for the same reason: a chapter too long to hold in your head defeats the freeze along with it. Nobody can tell whether a sprawling chapter has drifted from its promise until they've read it twice.

Distance is the cheapest edit there is. Freeze the chapter before reading back, because a drafter drafting and self-editing in the same pass produces something smooth, confident and much harder to see through than something drafted straight through a quota and left alone.

Parallel drafts from one brief

One documented version of this process split a manuscript into nine section files. Eight went to parallel drafters working from one shared brief; a lead rewrote the ninth and rebuilt the whole book from the parts. Eight parallel drafts from one brief move faster than one draft written straight through, and they cost nothing in consistency as long as the brief, the facts and the standard are identical for all eight. What they cost is a rebuild step at the end, where the parts have to agree with each other.

What done looks like

Every chapter has a stated word quota before drafting starts. Each one is drafted in a single sitting, frozen, and not reopened for self-editing in the same pass it was written in. If multiple drafters are working in parallel, they share one identical brief and the finished parts go through an explicit rebuild step rather than being stitched together silently.