Registration for continuing degree-seeking students typically begins in the middle of each semester for the subsequent semester. Registration is conducted online through Columbia's Online Administrative Student Information System (OASIS). Students are required to remove any existing registration holds (financial, advising, immunization, library, etc...) before they are eligible to register for classes. Students should check their Oasis accounts to review whether or not a registration hold will prevent them from registration. Registration assignments are based on the amount of credits a student has earned and this process grants priority registration to students with more earned cumulative credits.