This is not a required field and refers to your ID from your previous institutions, not Cairnmillar. Please either leave the field blank or use your student ID from your last institution to help your referees identify you. Contact your referees if you are not sure if they require your old ID number for reference purposes.
Please do not contact CMI about ID numbers. New students will not be given ID numbers until after they have accepted a potential offer of study and been enrolled in their course.