Learning theory ; Lehrplan; Instructional advice ; Rechnen (psycholing.) ; Calculation (psycholing.) ; Language and mathematics ; Mental representation (language acquisition) ; Object individuation; Conceptual development; Konzept (Spracherwerb) ; Concept formation ; Spracherwerb und neurologische Entwicklung; Language acquisition and neurological development; Sprache und Denken (Ontogenese) ; Language and thought (ontogenesis) ; Cognitive development; Language acquisition and cognitive development
