This article studies the planning activities carried out by the Spanish Education Authorities over the years, for the introduction of secondary education through high-schools. Initially, the analysis of the first such model, established upon the creation of the national education system in the decade of 1830, can confirm that it hardly suffered any modifications until the decade of 1910, so it can be concluded that in those years practically no planning tasks were carried out. Next, the actions and planning mechanisms undertaken by the dictatorship of Primo de Rivera, and later on by the Second Spanish Republic, are identified, together with the consequences brought about regarding the growth of the high school network and of the education rates.... [Leer más...]