2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/141287Modelling global disc galaxies is a difficult task which has previously resulted in the small scale physics of the interstellar medium being greatly simplified. In this talk, I compare simulations of galaxies with different ISM properties to determine the importance of the ISM structure in the star formation properties of the disc.4 pages, proceedings from the conference "Formation and Evolution of Galaxy Disks", Rome, October 1-5, 2007. To be published in the series of the Astronomical Society of the PacificAstrophysicstext