I can build a solid model for most of what lands on my desk now. But every so often the numbers look perfectly clean and are quietly lying to me, and I don't catch it until someone downstream makes a decision on it. Those are the ones that keep me up. I've learned enough to know how much I still can't see.
More people experience this than they realize.
You can model most problems, but the rare cases where clean numbers mislead you still slip past.
If this sounds familiar, the Library can help you find the bigger picture.