The Human Sorting Machine

Why this works

A rule almost never announces who it will exclude — that only becomes visible once real cases pass through it. Writing the rule before seeing the people it will sort, the way this activity forces, is close to how many real systems actually get built: the categories come first, the consequences come later, and by the time the consequences are visible the rule already feels settled.

How it works

1. Groups receive the scenario, but not the applicant cards yet.
2. Using only the category names they’ll be given — not the real data — groups write a sorting rule to decide who gets the spot.
3. Reveal the applicant cards. Apply the rule exactly as written.
4. Reveal who got the spot, and reveal one hidden context card about a student the rule excluded — something the rule’s categories couldn’t see, like having never had this opportunity before.
5. Give groups one chance to revise their rule, and discuss what changed and why.

Talk about it

• Which category in your rule turned out to be standing in for something else it wasn’t meant to measure?
• Was your rule unfair, or was it just missing information? Is that a meaningful difference, or does it matter equally to the person it excluded?
• Who should get to revise a rule like this — only the person who wrote it, or the people it sorts?