Inside San Diego State University's largest research partnership: University of California San Diego

Behind San Diego State University's research output sits a defining relationship: 2,217 co-authored works with University of California San Diego (United States) in the five years to 2025, the university's single largest collaboration.

It anchors an unusually connected research base: 917 collaborating institutions across 74 countries, producing 12,389 joint works over the window, with international co-authors on 23% of output.

The collaborative work travels: its field-weighted citation impact stands at 2.57, 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.