eng Science and Education Publishing American Journal of Educational Research 2333-4770 2014-12-14 2 12C 0 0 10.12691/education-2-12C-0 EDUCATION2014212C0 article Preface Carlos Eduardo de Carvalho Vargas carlos.vargas@ibge.gov.br 1 Pontifical Catholic University of Paraná, Curitiba, Brazil http://pubs.sciepub.com/education/2/12C/0/education-2-12C-0.pdf