Inside University of Southern California's largest research partnership: California Southern University

Behind University of Southern California's research output sits a defining relationship: 6,784 co-authored works with California Southern University (United States) in the five years to 2025, the university's single largest collaboration.

It anchors an unusually connected research base: 1,142 collaborating institutions across 80 countries, producing 61,722 joint works over the window, with international co-authors on 30% of output.

The collaborative work travels: its field-weighted citation impact stands at 3.06, 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.