How do I build a model that actually holds up under questions?

You did not come here because you cannot open a spreadsheet. You came because a model you built met a hard question in a room and did not survive it. That is the actual problem, and it is worth naming plainly. Most models fail from excess, not deficiency. Too many tabs, too many assumptions buried inside formulas, too much built to impress rather than to answer. Complexity feels like rigor. It is usually the opposite — it is a place to hide from the one question you are afraid someone will ask. You cannot control which questions people ask you. You can control whether your model was built to survive them. Start there.

◆ How this problem reads on the two dials

GuidanceKnowledge

More coaching

Some to learn

1:1 with AureliusWith others (a Pod)

Mostly you & the coach

A little with peers

The structure of driver-based modeling can be taught directly, but surviving real scrutiny is a discipline problem that requires practice and honest self-review.

How the two dials adapt to you →

What’s really going on

A model holds up when every number traces back to a driver you can defend out loud. It fails when it exists to look thorough rather than to answer the question asked. Choose three real drivers. Build only from them. Then test the model against the hardest question first, not the easiest.

🔒 What you’ll build togetherUnlock by starting

A moveName the three drivers that actually move the outcome. Build the model from them, not from everything you know how to calculate.

A moveBefore you build anything, write down the one hard question this model must survive. Design toward that question, not away from it.

A moveStrip out every formula you cannot explain out loud, in one sentence, to someone who did not build it.

A moveTest the model with the worst-case question first. If it breaks there, fix it there — do not wait for someone else to find it.

A movePut assumptions on a separate line from calculations, so anyone can see what you believed versus what you computed.

What changes unlock by starting

A model that survives hard questions instead of collapsing under them.
Faster, calmer answers when someone asks 'what if.'
Fewer assumptions hidden inside formulas where no one can check them.
The ability to defend every number in the room, because you built it to be defended.

One object, two jobs: a public answer to a real problem, and — the moment you start the chat — Aurelius’s live plan for your version of it.