The literature on school effects on the technical subjects of mathematics, science, and language skills finds that the effects are modest to small, probably because the schooling of these subjects is increasingly similar across schools and across nations as human capital investment becomes more important to families, schools, and nations alike (Baker & LeTendre, 2005). Given this homogenizing influence on school resources and teaching of technical subjects, student background, especially family socio-economic status, tends to have a stronger association with achievement, and there is evidence that this is now the case in many nations, even developing ones (Baker, Goesling, & LeTendre, 2002). Although, as suggested above, curricular content in global citizenship education is becoming similar across nations, the teaching of the topic has received less focus than the worldwide drive for standardization of mathematics, science, and language skills achievement.