A system that remains dependable when facing changes (new threats, failures, updates) is called resilient. The fast evolution of systems, including embedded systems, implies modifications of applications and system configuration, in particular at software level. Such changes may have an impact on the dependability of the system. A system is resilient when such changes do not invalidate its dependability mechanisms, said in a different way, current dependability mechanisms remain appropriate despite changes. In this paper we introduce some measures to quantify the capability of a system to remain dependable despite changes, i.e. how resilient it is!