2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/145680The scaling relations between rotation velocity, size and luminosity form a benchmark test for any theory of disk galaxy formation. We confront recent theoretical models of disk formation to a recent large compilation of such scaling relations. We stress the importance of achieving a fair comparison between models and observations.4 pages, 1 figure, to appear in proceedings of "Formation and Evolution of Galaxy Disks", Rome, October 2007, Eds. J. Funes and E. M. CorsiniAstrophysicsConfronting Scaling Relations of Spiral Galaxies with Hierarchical Models of Disk Formationtext