TELF Online Training Worldwide copyright © 2014  languagecenter.com powered by: clubwww1 ENGLISH LANGUAGE PROFICIENCY LEVELS The six language proficiency levels outline the progression of language development in the acquisition of English as an additional language. The language proficiency levels define expected performance and describe what ELLs can do at each level of proficiency. At the given level of English language proficiency, English language learners will process, understand, produce or use: