History of linguistics (20th century) ; History of linguistics (21st century) ; Applied linguistics ; Glottodidaktik; Lehrforschung; Pädagogische Linguistik; Pedagogical linguistics; Language teaching research ; Techniques (in research) ; Research techniques ; Sentence processing; Language processing; Language comprehension ; Language and society ; Erstspracherwerb; First language acquisition; Ontogenese; Language acquisition ; Multilingualism; Polylingualism; Plurilingualism ; Second language acquisition (psycholing.)