Needs assessment (language teaching) ; Second language acquisition (language teaching) ; Zweitspracherwerb (Unterricht) ; Foreign language teaching ; Feedback (language teaching) ; Rückmeldung (Sprachunterricht) ; Lehrerkommentar; Teacher's comment; Correction (in language teaching) ; Lernmotivation; Affekt (Einfluss auf Zweitspracherwerb) ; Affect (influence on second language acquisition) ; Motivation research ; Glottodidaktik; Lehrforschung; Pädagogische Linguistik; Pedagogical linguistics; Language teaching research ; Classroom communication; Instructional communication ; Negative evidence (second language acquisition) ; Feedback (second language acquisition)