The issue of this article is to analyze school desertion concerning an important part of working teenagers of Lima, the capital of Peru. The logic of their respective life course towards school desertion has to be focused according to a methodological approach breaking down complexity characterizing dropping out of school. The tangle of factors into this process and the different kinds of exterior and interior "determinations" to adolescent can only be studied from their life story and by using the Ageven sheet to understand situation and action logics ending up to school desertion.
