Language teaching ; Computer (Sprachunterricht) ; Computer (language teaching) ; CALL; E-learning; Mobile-assisted language learning; MALL ; DaF; Deutsch als Zweitsprache; German as a second language; DaZ; German as a foreign language ; Rule (teaching of grammar) ; Transfer (language teaching) ; Transfer (Sprachunterricht) ; Interference (language teaching) ; Induction (cognitive science) ; Sprachperzeption/Sprachproduktion (Asymmetrie von) ; Language perception/language production (disparity in) ; Active vocabulary/passive vocabulary; Passive vocabulary; Disparity; Language production/language perception (disparity in) ; Kindersprache (Sprachverständnis) ; Children's comprehension of language; Language comprehension in children ; Transfer (second language acquisition) ; Transfer (Zweitspracherwerb) ; Cross-linguistic influence (second language acquisition) ; Interference (second language acquisition) ; German