The process of individual identity formation is still an enigma, as is the capacity of public bodies to intervene in it. In 1983, the Catalan education system became bilingual, and Catalan, along with Spanish, was taught in schools. Using survey data from Catalonia we show that respondents who have been exposed for a longer time period to teaching in Catalan have stronger Catalan feelings. The effect also appears to be present among individuals whose parents do not have Catalan origins; in addition the reform affects political preferences and attitudes towards the organization of the State.