The disease-modifying therapies for multiple sclerosis (MS) aim to slow down the disease process and consequent damage to central nervous system. This study is an open-label, multicentric study planned to assess the tolerability of Rebif New Formulation in an Australian clinical setting by the incidence of ISRs. A total of 100 subjects having relapsing MS across approximately 20 sites in Australia will be enrolled into the study. Subject visits will be scheduled at baseline (month 0) and months 3, 6, 9 and 12 and the data related to demographic factors, disease history, quality of life and adverse drug reactions (ADRs) will be recorded in the case report form (CRF).