What are the guidelines for proficiency in the English language for an international applicant?

Applicants who are non-native English speakers and who received their undergraduate degree from an institution where English is not the primary language of instruction must prove their English proficiency by earning either a minimum score of 80 on the Internet based test (iBT) of the Test of English as a Foreign Language (TOEFL) or a minimum score of 6.5 on the International English Language Testing System (IELTS) Academic test.”