This page has no philosophy in it. It is a habit for keeping track of how well you actually know the things you act on — and it works whether or not you agree with a single other page on this site. If you take one thing from here, take this.
If you can't get it into a sentence, you don't have a claim yet — you have a mood. That's fine, but label it as one.
Not how strongly you feel it. How you came to know it.
Be specific enough that someone else could go and check. If nothing could prove it wrong, it isn't a claim about the world — and you should stop spending decisions on it.
Don't delete it. The list of things you were wrong about, with dates, is the only real evidence that your other beliefs have been tested at all.
Nothing to do with this site. A team is losing customers.
Notice what the habit did. It didn't make the team smarter — it made one cheap test obvious, and it caught a guess that had been quietly promoted to reason we're building things. That promotion is the failure mode. It happens silently, and labels are how you catch it.
Notice also what stayed. The dead claim is still written down, with its date. Next year, when someone says "we've always known it was the integrations," the record says otherwise — and says exactly when it was learned, and what believing the other thing cost.
Four steps, four labels, one rule. It costs about ten minutes per claim and it works on product decisions, hiring beliefs, health advice, and arguments with yourself.
You can stop here. Nothing else on this site is required for it to work, and if you use only this page, it has done its job.
We hold ourselves to this. Our own list of dead claims is public, dated, and includes ones that cost us a great deal. If you'd rather see the ideas than the method, start plainly — or leave, which is a real option and always has been.