DaF; Deutsch als Zweitsprache; German as a second language; DaZ; German as a foreign language ; Lehrerausbildung; Teacher training; Lehrerfortbildung; In-service teacher training; Teacher education ; Glottodidaktik; Lehrforschung; Pädagogische Linguistik; Pedagogical linguistics; Language teaching research ; Körpersprache; Chronemics; Kinetik; Kinesics; Nonverbal communication ; Norm of interaction; Regel (pragm.) ; Rule (pragm.) ; Interactional norm ; Cross-cultural pragmatics; Pragmatics, cross-cultural; Pragmatik, interkulturelle; Intercultural communication ; Visual access; Gaze; Blickrichtung; Eye gaze ; Ethnopragmatik; Ethnopragmatics; Culture-specific communication ; Misunderstanding ; Classroom communication; Instructional communication ; German