The stat I refuse to use

There is a number you have almost certainly seen. It turns up in flow talks, in course sales pages, in a hundred confident LinkedIn posts:

“Flow makes you 500% more productive.”

It is a fantastic number. It is quotable, it is dramatic, and it would look great at the top of a sales page. We refuse to use it. This piece is about why — because how we treat that number tells you more about whether to trust us than any testimonial could.

Where the number actually comes from

Follow the “500%” back to its root and you do not arrive at a controlled experiment. You arrive at executive self-report: a group of senior managers, asked to estimate how much more productive they felt in their most absorbed states. That is the origin. It has been repeated so many times, by so many people who wanted it to be true, that it now wears the costume of a scientific finding. C

Let us be precise about the problem. Self-report is not worthless — it is a real signal about experience. But “a busy executive estimated they felt five times sharper” is a very different claim from “flow multiplies measured output by five”, and only the first one is actually supported. The number never survived a controlled trial. So it does not get to wear the lab coat.

If a number sounds too good to put a citation next to, that is usually because there isn’t one.

You will see the same move with “490% faster skill acquisition” and “up to 1000%”. Same pattern: a striking figure, a fuzzy origin, and a lot of people with something to sell repeating it until it calcifies. We will happily tell you these claims exist — that is honest reporting on the state of the field. We will never present them as evidence for anything we teach.

How we grade instead

Every factual claim on this site carries a small receipt badge, and behind each badge sits a grade. Here is the whole scheme, in plain English:

• A Settled. Well-supported by academic or official sources. We can state it with careful wording. (“Attending consciously to a trained skill disrupts it — paralysis by analysis.”)
• B Practitioner. A credible interpretation from experienced practitioners, not a lab finding. We use it, framed as interpretation. (Mark Douglas on thinking in probabilities.)
• C Debated. Popular but contested, or over-repeated. We attribute it clearly and never present it as settled. (The “self-monitoring switches off in flow” story — a leading explanation, still argued.)
• D Metaphor. A teaching analogy, useful for understanding, not a scientific claim. We flag it as such.

And there is a fifth grade you will never see on the page, because it never ships: E — prohibited. Claims that are too risky, too weakly sourced, or that would imply a promise we have no business making. The 500% stat, asserted as fact, sits here.

Why bother being this fussy

Because you have been sold enough hype by people with sports-car thumbnails, and you can smell it now. The performance-psychology space is full of confident numbers with no receipts. The moment we let one slide onto a sales page, we become one more of those voices — and we would deserve your scepticism.

So the honesty policy is not a compliance chore we tolerate. It is the product. When we say something is grade A, you can click the receipt and check. When something is only C, we say so out loud, in the same breath, rather than hoping you will not notice. That is the deal.

The number we would rather earn

There is a version of this that is genuinely exciting and genuinely defensible: the state where a quieter mind lets trained skill run unobstructed is real, well-studied, and worth training for. We do not need to inflate it. We just need to teach it accurately and let the results — the ones you feel in your own execution — be the proof.

If you want to see the full grading matrix and the receipts in action, it lives on The Method. And if you have a friend who has been burned by hype merchants, this is the piece to forward them. It was written for them.

No Lamborghinis. No 500%. Just the receipts.