How We Score

What the SI Score is

Every card carries an SI Score: six categories, each scored from 1 to 10, for a total out of 60. Each collection uses its own six category names, because what counts as impact differs between, say, an invention and a moment in history.

Scores are editorial judgements made against a published rubric. They compare cards within a collection, not between collections — a History card and an Inventions card are scored on different scales.

The six categories in each collection

Reviews and revisions

Scores are reviewed as articles are revised. When new research changes how we understand a card, its score can change too. Newly added cards show "SI Score coming soon" until their scores have been reviewed.