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Glossary term Social

Goodhart's Law

When a measure becomes a target, it stops being a good measure, because people optimize the number rather than the thing it stood for. A bounty on rat tails led people to breed rats for their tails.

Where you see this in practice

The mechanics that lean on it

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Leaderboards

A ranked list of users or groups ordered by a performance metric, making individual standing visible and publicly comparable.

In the full library
Retention08

Achievements / Milestones

Named, permanent markers of progress or behaviour that the user collects over time.

In the full library