“…The classical and well-known criterion “ethnicity/nationality” is replaced in this analytical context by the above-mentioned domestic or foreign educational biography. Since the so-called “migration background” has a selective effect, especially with regard to the second or subsequent generations [ 11 ], the disclosure and collection in this context would be misleading. A study which purely compares people with and without a migration background would result in an undifferentiated and unspecified perception.…”