I applied 12/15. Columbia must have a pretty intricate system of how they are getting back to students. They probably clump each application based on concentration, method, and length of program. If you really think about it, that is a lot of combinations to sort through and decide candidacy based on all applicant's qualifications in comparison to each others per group combo...does that make any sense? haha but yeah, thats what I am thinking. I am also thinking I'm the last one who hasn't heard back still that applied in December. I applied advanced standing, SEA, school-linked school-based services.