The school integration to debate focuses on the treatment of diversity motivated by the incorporation of students of foreign origin, with different languages, customs and previous knowledge. The work, after questioning the meaning and implications of the concept of school integration, analyzes the measures and initiatives undertaken in Spain and also, by way of comparison, in some foreign countries. Each of the cases has been approached from one of these three perspectives, the point of view of the students, the external observation or that of the teachers involved in its application.