Every business decision rests on assumptions. Most of them are invisible.
A product roadmap assumes the team knows what customers want. A hiring plan assumes the current org structure is right. A pricing change assumes customers will pay more for the same thing. These assumptions aren’t wrong by default — but when they go unexamined, they become the architecture of expensive mistakes.
An assumption audit is a structured way to make those hidden beliefs visible, sort them by how much evidence supports them, and decide which ones to test before committing resources. It takes about 30 minutes for a single decision, and it can prevent weeks or months of misdirected work.
Here’s the question nobody talks about: when should you NOT use first-principles thinking?
First-principles thinking is powerful when it’s needed. But it’s also expensive — it takes time, energy, and cognitive effort to decompose a problem to fundamentals. And for many problems, a proven framework or best practice is the better choice.
The trick is knowing which tool fits the situation. This article gives you a 60-second test to decide.
Most advice about first-principles thinking goes something like this: question your assumptions, break the problem down to its fundamentals, and rebuild from there. Which is about as useful as telling someone to “be more creative.”
The hard part was never understanding the concept. The hard part is doing it — on a real problem, with real constraints, when you’re under pressure.
This article walks through the actual steps. One problem, start to finish.