There are a number of communities that can report some success in managing outdoor cats even though there are no reports on such projects in the published academic literature. This report discusses successful projects managing outdoor cats on San Nicolas island, California, Alachua County, Florida, Portland, Oregon and Maui island in Hawaii.
Rowan, Andrew N. and Hadidian, John
"Cat Management Successes,"
WellBeing News: Vol. 3:
7, Article 2.
Available at: https://www.wellbeingintlstudiesrepository.org/wbn/vol3/iss7/2