Inside École Normale Supérieure de Lyon's largest research partnership: Université Claude Bernard Lyon 1

Behind École Normale Supérieure de Lyon's research output sits a defining relationship: 13,616 co-authored works with Université Claude Bernard Lyon 1 (France) in the five years to 2025, the university's single largest collaboration.

It anchors an unusually connected research base: 1,026 collaborating institutions across 77 countries, producing 14,227 joint works over the window, with international co-authors on 31% of output.

The collaborative work travels: its field-weighted citation impact stands at 1.59, where the world average is 1.0.

The Research Collaboration Index, the first global account of how universities actually collaborate, publishes its first full edition on Tuesday 15 September at 09:00 UK.

Every figure derives from the open global research record and is checkable at source.