Ask most owners how the business is doing and the answer is a revenue figure. It's the number on the dashboard and the one that feels like the score.
But revenue only tells you how much came in — not how much you kept, or which parts of the business kept it. Two companies with identical revenue can have wildly different profit, and the same company can grow revenue while quietly losing ground on margin.
What to watch instead
Start with profit by the thing your business is really made of — product, customer, location, or job. Not the single line at the bottom of the P&L, which blends your best and worst work into one comfortable number, but a ranked view of where money is actually made and lost.
That view almost always holds a surprise: a handful of things carry the business, and a long tail earns little or loses money. Once you can see it, the moves are usually obvious — and it's the same shift The Aperture Method™ starts with, turning revenue you can count into profit you can act on.