The MITx xMinor in Materials for Electronic, Optical, and Magnetic Devices is a certification program offered by MITx that is designed and administered by MIT’s Department of Materials Science and Engineering. This xMinor credential consists of three college-level undergraduate courses and a comprehensive, proctored final examination.Only people who have earned certificates of completion in 3.012x, 3.024x, and 3.15x are qualified to take this exam.