By pointing to what's documented and naming what's still open.
The documented record is public. A Texas academy's records, obtained through a formal public-records request: 620 students enrolled over 14 years, 44 finished. NCRA's own Annual School Reports: a 14.4% average graduation rate, which NCRA itself calls "extremely low."
Federal education data: court reporting graduates fell from 747 in 2000 to 287 in 2022. Every source is cited on our completion-rates page, and the underlying documents are there to download. And the math behind BREVITY is published — the formulas that measure what every outline costs to write, with the work shown, so any reader can rerun the numbers or challenge them.
What's still open: no outside researcher has yet run a controlled study comparing completion rates across theories. That study should exist. The profession has never once tested whether theory design affects who finishes — its own best-practices research examined every variable except this one. We'd welcome that study, and our methodology is public precisely so it can be tested.
That's the standard we hold ourselves to, and it's the standard worth asking of any theory: what can you verify before you pay?