The Chemical Engineering PhD degree at UC Santa Barbara is awarded to PhD candidates following successful defense of the dissertation. Students must first satisfy the candidacy requirements and advance to candidacy. Applicants whose native language is not English are required to take the Test of English as a Foreign Language (TOEFL), the International English Language Testing System (IELTS), or the Duolingo English Test (DET). TOEFL paper-based test (PBT) – 550, TOEFL internet-based test (iBT) and TOEFL iBT Home Edition – 80, IELTS Academic and IELTS Indicator - Overall Band Score of 7.