“…As with the Aprender a Convivir program, other early intervention programs that have also been evaluated have caused a positive improvement in the prosocial behavior of the pupils (Kramer, Caldarella, Christensen, & Shatzer, 2010;Domitrovich, Cortes, & Greenberg, 2007;Moraru, Stoica, Tomuletiu, & Filpisan, 2011). However, some programs that also contributed to the improvement of 4 year-old boys and girls in multiple variables related to social behavior did not produce significant effects on social cooperation, also measured with the PKBS-2, as occurred in the case of the Al's Pals program (Lynch, G eller, & Schmidt, 2004).…”