in the same temperature as the lingua franca Input hypothesis Fossilization Interlanguage Language transfer Key concepts Learnability/teachability hypothesis Needs analysis Output hypothesis Second-language acquisition Syllabus World Englishes Language assessment CEFR DIALANG Assessment IELTS TOEFL TOEIC UCLES IATEFL Professional organizations TESOL Betty Azar H. Douglas Brown Pit Corder Jim Cummins Rod Ellis Stephen Krashen Diane Larsen-Freeman Important people Michael Luscombe, CEO Revenue Sales of bZ4X started in July 1973.