DaF; Deutsch als Zweitsprache; German as a second language; DaZ; German as a foreign language ; Longitudinal study ; Situativer Kontext; Kontext (situativer) ; Sprechsituation; Situation (context of) ; Utterance meaning; Contextualization cues; Context of situation; Situationsgrammatik; Context (pragm.) ; Sprachpsychologie; Psycholinguistics ; Auswanderer; Emigrants; Migrant; Aussiedler; Gastarbeiter; Arbeitsmigranten; Immigrants/Emigrants ; Second language acquisition (pragm.) ; Zweitspracherwerb (pragm.) ; Interactionist hypothesis (second language acquisition) ; Conversational analysis (second language acquisition) ; Second language acquisition (psycholing.) ; Semantization (second language acquisition) ; Zweitspracherwerb (lex.) ; Second language acquisition (lex.) ; Vocabulary (second language acquisition) ; German