This document discusses the concept of integration of immigrants in Italy and Europe. It describes how integration became a key concept in the 1970s to describe migration processes, replacing earlier terms like assimilation. The concept of integration emphasizes acceptance of cultural diversity compared to assimilation. The document also outlines debates around measuring integration through indicators and developing surveys in Italy, noting challenges due to data quality but recent improvements. It proposes analyzing integration on different levels and improving reliability and longitudinal data.