Meta analysis; Literaturstudie; Literature review; Scientific review ; Evaluation criterion (language teaching) ; Lehrplan; Syllabus; Curriculum research ; English as a second language; ESL; TESOL ; Cross-cultural pragmatics; Pragmatics, cross-cultural; Pragmatik, interkulturelle; Intercultural communication ; Second language acquisition (pragm.) ; Zweitspracherwerb (pragm.) ; Interactionist hypothesis (second language acquisition) ; Conversational analysis (second language acquisition)