Stress tests your position by building the strongest case against it.

Take your current position on a meaningful decision. Write the single strongest argument a qualified opponent would make against you.

If you can’t build a credible opposition to that counter argument in ten minutes, you don’t hold the position; you inherited it. If you can, your position either survives sharper, or you find the flaw before the market does.

OUTPUT: A written counter-case you can defend against.

From The Operator’s Edge, Principle #3.