Applied linguistics ; Language testing ; Evaluation criterion (language testing) ; English as a second language; ESL; TESOL ; Techniques (in research) ; Research techniques ; Pragmatische Kompetenz; Pragmatic competence; Communicative competence ; Second language acquisition (pragm.) ; Zweitspracherwerb (pragm.) ; Interactionist hypothesis (second language acquisition) ; Conversational analysis (second language acquisition) ; English