Interview (language testing) ; Word level test ; English as a second language; ESL; TESOL ; Wortschatz (Sprachunterricht) ; Lernwortschatz; Vocabulary teaching ; Lexical complexity measure; Wortschatzreichtum; Lexical sophistication; Lexical diversity; Type-token ratio (lex.) ; Zweitspracherwerb (Textproduktion) ; Second language acquisition (text production) ; Text production (second language acquisition) ; English