The students selected via the "concours" remain at the school for a length of time ranging from four to six years. "Normaliens" from France and other European Union countries are considered civil servants in training. Many students devote at least one of those years to the agrégation, which allows them to teach in high schools or universities. Faculty recruitment is selective, with between zero and one ENS professorship open per year. Faculty recruitments usually happen upon previous incumbent retirements. In informal ENS jargon, ENS full professors are popularly called PdPs (""professeurs des professeurs")" because traditionally ENS was created to educate future professors.