Method: REMOVE_COHORT
Method: EDIT_CAPACITY
Method: DEL_PERIOD
Method: ADD_PERIOD
Method: DEL_STUDENT_FROM_COHORT
Method: INS_CONTEXT_OBJECT
Method: EDIT_ATTRIBUTES
Method: INS_STUDENT_TO_COHORT
Method: SAVE_COHORT
Method: APPEND_COHORT
Method: EDIT_COHORT_DESCRIPTION