The Science of Relative Sizing

Humans are fundamentally terrible at estimating absolute values.

If I ask you how many pounds a Great Dane weighs, you might guess anywhere from 80 to 200. It's a shot in the dark. But if I put a Great Dane next to a Chihuahua and ask, "Which one is heavier?" you know the answer instantly, with 100% certainty.

This is the science of relative sizing, and our brains are highly optimized for it.

Establishing Your Baseline

When we ask developers, "How many hours will this take?", we are asking for an absolute value. Because software is full of invisible unknowns, they will almost always guess wrong.

But when we ask, "Is this login feature more or less complex than the password reset feature we built last week?", they will nail the answer almost every time.

To make this work, your team needs a baseline. Pick a well-understood, recently completed task and call it a "3". Everything else is now judged against that task. Is it twice as hard? It's a 5 or an 8. Is it easier? It's a 1 or a 2.

This is why estimation poker exists. We aren't guessing time; we are comparing relative effort. Stop asking for hours. Fire up our online estimate poker tool, pick your baseline story, and start comparing.