The fourth year is the beginning of more specialized studies: students not entering a Corps de l'État must join either a Master's program, a doctorate program, another ParisTech college or institute such as the École des mines de Paris or ENSAE, or a specialization institute such as Supaéro in Toulouse or ENSPM in Rueil-Malmaison. The reason for this is that the generic education given at Polytechnique is more focused on developing thinking skills than preparing for the transition to an actual engineering occupation, which requires further technical education.