The acceleration of the phenomena of marginalization and social exclusion, mainly due to the new parameters of global competition imposed by the productive system, the educational context has been assigned a central place in response to the demands of training and skills, creating new dynamics of exclusion. Faced with this problem have been considered good educational practices that reduce these processes those promoting social cohesion. Through a qualitative methodology we approach three public high schools located in areas at risk of social exclusion to identify potential best practices in various measures to prevent failure offered in our education system, in order to disseminate them for possible use in different contexts and for different educational actors. Finally, we establish a cross connection between the identified best practices, based on the concepts of horizontality, permeability, balance and flexibility, allowing actions to understand them as related and converging towards common goals.

School failure, social and educational exclusion, prevention measures, good practices.