Cultural pluralisation - reinforced by immigration - has had major consequences for the political agenda in recent years in liberal democratic states. New types of tension have arisen - new forms of social and cultural differentiation, and new patterns of inequality. The diversity also reshapes the frame of reference for traditional policy instruments employed by modern welfare states; new issues arise that are linked to rights, legitimacy, and policy measures of a general and targeted nature. This volume of Comparative Social Research addresses a number of issues related to this new diversity. Common themes are multiculturalism, power and integration, and these themes are analyzed through a comparative lens.