Guidance on requesting a CAS for a Tier 4 Doctorate Extension Scheme application. Who is able to request a CAS for use in a Doctoral Extension Scheme (DES) application? The Tier 4 Doctorate Extension Scheme is for students who are studying for a doctorate level qualification. At the University of Edinburgh, students who are studying the following programmes can apply for this visa route: Doctor of Dental Surgery (DDS) Doctor of Psychotherapy and Counselling Doctor of Philosophy (PhD) Doctor of Science (DSc) Doctor ofVeterinary Medicine (DVMS) Doctor of Education (EdD) Doctor of Engineering (EngD) Doctor of Medicine (MD) Doctor of Law (LLD) When can I request a CAS for use in a Doctoral Extension Scheme (DES) application? You are able to request a CAS for use in a DES application once you have completed and passed your viva voce exam and have agreed the date for the final submission of your thesis. Please note: You must submit the form and your visa application before you submit your thesis. This article was published on 2024-07-29