Language testing ; Evaluation criterion (language testing) ; PPVT; Echelle de vocabulaire en images Peabody; EVIP; Test de Vocabulario en Imagenes Peabody; TVIP ; MLU; Mean length of utterance; Sentence length (child language) ; Phonemik (Spracherwerb) ; Phonetics (language acquisition) ; Kindersprache (phonet./phonem.) ; Child language (phonet./phonem.) ; Spracherwerb (phonet./phonem.) ; Language acquisition (phonet./phonem.) ; Phonological development ; Sprachentwicklungsverzögerung; Language delay ; Spracherwerb (lex.) ; Language acquisition (lex.) ; Vocabulary (language acquisition) ; Screening (speech therapy) ; Assessment criterion (speech therapy) ; English (American) ; USA (English language in the) ; USA (engl. Sprache in den) ; English in the USA; Englisch in den USA; American English