← Mental Models
PHX
HumanExecutionServes HX in the equation

The Denominator Rule

“Output is capped by vision clarity and human experience. Strengthen the base and everything above it gets more powerful.”

The Challenge

Companies pour resources into the numerator, more tools, more agents, more output, while the denominator (clarity and the human-machine interface) stays weak. You cannot out-tool a small denominator; you can only divide by it.

The Framework
01

Everything sits over a base

Vision clarity and human experience are the denominator. All output is divided by them.

02

Weak base, wasted top

A brilliant model over a confusing interface produces confident noise at scale.

03

Strengthen the base first

A 10% stronger denominator multiplies every unit of effort above it, cheaper than piling on more.

A Worked Example

A team buys three more AI tools and ships no faster. They stop, fix the denominator, one clear owner, one shared definition of "good," one clean interface to the agents, and the tools they already had suddenly produce, because the base finally supported them.

Where it fails · the limit

The denominator can be over-engineered. Past a point, more process and polish on the base becomes its own numerator bloat. Strengthen until friction is gone, then stop.

Run it on your org

Are you adding to the top of the fraction, or strengthening the bottom?

TL;DR
  • Output is divided by clarity and HX, not just added to.
  • A stronger base multiplies everything above it.
  • Fix the denominator before buying more numerator.
For you this week · no budget required
01Pick one workflow and write its single definition of "good".
02Remove one source of ambiguity in how work is handed to your tools.