2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/3520I discuss the case for an efficient orbital braking mechanism in CVs, and the effect of nova outbursts on the observed range of mass transfer rates. I review the continuing problem that models have in interpreting the short-period cut-off of the CV period distribution.10 pages, including 5 figures. To appear in "The Physics of Cataclysmic Variables and Related Objects", eds. B. Gaensicke, K. Beuermann, K. Reinsch, ASP Conf. SeriesAstrophysicstext