In this number that celebrates the 25 years of Sarmiento present an approach to the most notable appearances of the international movement of the New Education, so much historical that conceptual; to the time that analyse his influences and the development of the back educational investigation, particularly in relation to its presence in Spain, Portugal and Brazil. The monograph of this number was coodinated by he professors Antón Costa Rico (University of Santiago de Compostela) and Luis A. Marques Alves (University of Porto)