<p>For anyone still looking for a rough estimate of the MMSS acceptance rate. Last year, 175 prospective students sent in an MMSS application. Out of those 175, only 67 of them were accepted into Northwestern. Getting accepted to Northwestern, as AJB1993 mentioned, is probably the most difficult part, as it is the biggest weeder of the MMSS applications. Of the 67 applicants who were accepted to Northwestern, 61 were accepted into MMSS. Hope that helps!</p>