The reading and the readings of young people are at the crossroads of social and cultural mediations in which the school institution and the family share the first role. During decades, work on the reading of the young people distinguished the readings for leisure and the readings for school. Since about fifteen years, this cleavage does not correspond any more to reality. Well before the learning of the reading, the desire of reading takes its source in the exercise of the mother tongue and in the family uses of print. Reading skills come to reinforce it. The acquisition of a reading practice and the construction of a reader behaviour take place at home according to the choices of youth literature generally presented by the primary school and the beginning of secondary school. With the age of the secondary school, the reader builds two different universes of reading. One is composed of texts prescribed by the teachers and the other of readings called "for oneself". Whatever the age and skills, the dynamics of the activity of reading remains fragile. It rests on emotional investments.