Product Management playbook/Module 5 · Metrics

Day 49 / 100 · Metrics · Goodhart's Law in practice

When a measure becomes a target…

…it stops being a good measure. People optimise the number, and the thing it was meant to represent quietly suffers.

How It Shows Up

Tickets closed

Tickets get closed before problems are solved.

Velocity

Story points quietly inflate.

Calls made

More calls, lower quality.

AI acceptance rate

People approve outputs without checking them.

Source: Patterns via PubMed Central ↗

Measure the goal, not the game.