Sociology can approach the elemental problem of the integration of mod
em societies from various different angles. On one level, integration
can be understood in economic, political, solidary and cultural terms.
On a further level, it is necessary to differentiate between systemic
and social integration. Finally social and systemic integration are n
o longer a matter for national societies, but are increasingly the con
cern of supranational and global units. A workable solution to the pro
blem of the integration of modern societies must take into account the
se various approaches and levels and fuse them together to form a cohe
rent theory.