This is a Phase 4, prospective, open-label, randomized, cross-over, multicenter trial to evaluate ease-of-use with Rebif® Rebidose® and Rebiject II® autoinjectors in subjects with relapsing remitting multiple sclerosis (RRMS). Subjects will participate in the study for up to 10 weeks (including screening and treatment periods). The treatment period will last 8 weeks and include 12 self-injections using the Rebif® Rebidose® device and 12 self-injections using the Rebiject II® device.