Prof. dr. dr. h. c. Erik De Corte: A Biographical Sketch -- Introduction / Filip Dochy, Lieven Verschaffel, Monique Boekaerts and Stella Vosniadou -- Part I. Learning and Development -- 1. Curriculum, Pedagogy, and Learning in Early Childhood: Sites for Struggle -- Sites for Progress / Elizabeth Wood and Neville Bennett -- 2. Mathematics in the Mind: Architecture, Development, and Educational Implications / Andreas Demetriou and Areti Panaoura -- 3. Attentional Processes, Abstraction, and Transfer in Early Mathematical Development / Erno Lehtinen and Minna M. Hannula -- 4. Examining Mathematics Learning From a Conceptual Change Point of View: Implications for the Design of Learning Environments / Stella Vosniadou and Xenia Vamvakoussi.