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> Leverage has a precise concrete meaning in this article.

Er, not really. From the article:

> Leverage = Impact Produced / Time Invested

"Impact Produced" has a precise, concrete meaning?

Sure. For software, it might be reuse of a component. Reuse leverages existing code. This is precise, unambiguous, and frankly uncontroversial.

> it might be

> This is... unambiguous,

:)

How about revenue or moving the needle on a key business metric like churn or order flow conversion rate.