„Substantial ability gaps across children from various socioeconomic groups emerge before they start school.“
Univ.-Prof. James Heckman, „American Educator“, Frühjahr 2011, S. 34
„Substantial ability gaps across children from various socioeconomic groups emerge before they start school.“
Univ.-Prof. James Heckman, „American Educator“, Frühjahr 2011, S. 34