Definition
Inversion is the practice of turning a problem upside down. Instead of asking how to reach a goal, you ask what would guarantee failure — and then resolve to avoid those things. Instead of trying to prove a belief true, you try hard to prove it false.
The technique works because forward reasoning and backward reasoning expose different information. Some answers are nearly invisible from the front and obvious from the back. By starting at the unwanted endpoint and reasoning toward the present, you surface obstacles, assumptions, and failure modes that a direct approach would miss.
Why it matters
How it works
To invert a goal, list everything that would ensure you fail, then treat that list as a set of things to eliminate. To invert a belief, deliberately build the strongest case against it and see whether it survives. To invert a plan, imagine it has already failed and work backward to explain why.
The result is a complementary view: forward thinking sets direction, inversion stress-tests it.