Narrow claims are provable but risk being unimportant; broad claims are important but unprovable. The craft is finding the narrowest claim that still matters. Slide the scope controls, attach a because-clause, decide whether to state the stakes, and pick a qualifier — the sentence rebuilds live and the dot on the right moves between the two failure corners.
Build the claim
Working idea
Scope — narrow until it is provable
Population
Place & time
Aspect & mechanism
The because-clause
Qualifier
Stakes
Your claim, live
scopereasonstakesqualifier
Provable vs. worth proving
Note: the chapter counts four narrowing axes — population, place, time and aspect. Place and time share one control here. Two of the four is usually enough; all four at once shrinks a claim into triviality, which is the opposite failure.