Records of multiple sclerosis patients who underwent examination by evoked potentials at AUB from October 2011 till December 2014 will be evaluated. Patient’s data will be extracted, coded, and analyzed cross-sectionally to evaluate the initial contribution of EPs in the diagnosis of MS. Subsequently, patients' follow up EPs will be evaluated to determine the rate of studies indicating demyelination, and the medical records will be evaluated to determine the variables related to abnormalities as well as the consequent changes in treatment given the abnormal EPs. The relationship between MRI, clinical, and EPs results will be examined as well.