Dr.in Annika Brück-Hübner is a scientific research assistant at the "Center for Cooperative Teaching and Learning" (ZekoLL) at the Technische Hochschule Mittelhessen (THM) and lecturer at the "Department of Early Childhood and Teacher Education" of Justus Liebig University Giessen (Germany). Dr.in Ulrike Beate Müller is a scientific research assistant at the "Department of Early Childhood and Teacher Education" of Justus Liebig University Giessen (Germany). Dr.in Anja Seifert is a professor for education, specialized in Primary School Education and Didactics of General Sciences at Justus Liebig University Giessen (Germany).