The author has undeservedly entrusted me with this brief foreword. Perhaps because he has seen me publish a few reviews of books in the social sciences. It is always a complicated approach. The rule in our society is that of reciprocal ignorance. If I have accepted this exercise, it is because I see another generation dawning in this text, less prone to enclose itself in chapels and closed circles (Hugo Neira Samanez, sociologist).