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The author of this article describes residential segregation of foreigners in Barcelona. She presents some theoretical considerations, makes statistical calculations pertaining to the problem, and defines causal factors of residential segregation. What is important, residential segregation in Barcelona may be far deeper than in other cities because of the relatively strong separatism in Catalonia and the required knowledge of the Catalan language. These factors make full access to local labour market very difficult for immigrants and lead to their marginalization. In the statistical calculations a measure of residential segregation (Duncan, Duncan 1955) is used which allows a comparison of the situation in Barcelona and in other cities, as well as an analysis of changes in Barcelona in recent years.

The language question are phenomena resulting from contacts of two or more languages on the same territory or in the same community. It consists in co-existence and/or conflicts of languages and in language policies carried out by national and regional governments, and by ethnic movements aiming at maintaining or changing the language situation on a given territory. The main issues linked to the language question in the contemporary world are the following: 1) domination of the English language as an international language, supported by the globalisation and facilitating the globalisation. The domination of English puts on unequal footing people of the world and causes dissatisfaction of some parts of non-English native speakers; 2) extinction of languages as a result of assimilation of small ethno-linguistic groups. This phenomenon generates alarm of some groups of scientists and public opinion; 3) language barrier hampering development of education, economy and democracy in many parts of the world, especially in the post-colonial countries; 4) international migrations. These put migrants themselves and societies and governments of recipient countries in front of the question of the attitude towards maintaining of the cultural and linguistic identity of the migrants, this question being solved in different ways in different countries and historical periods.

Multiculturalism is a kind of social policy that depends on cultural neutrality of the state. Huge communities of immigrants of non-European cultures arose in Western Europe. In response to this phenomenon, European states initiated a multicultural social policy. In effect, many behaviours of immigrants turned out to be at variance with human rights, but consistent with multiculturalism. Great cultural distance between European societies and immigrants caused more serious problems with integration than had been expected. Nowadays, we can observe a contestation, but not abandonment, of the multicultural policy, accompanied by anti-immigrant sentiments. A new social policy ought to facilitate the adaptation of immigrants in economic and politic institutions, and to respect human rights as a key value.

To assess the development level of Polish regions, it is necessary to observe changes in the country taking into account its sustainable development. Differences between regions are due mainly to their nature, their social, economic and institutional conditions and their political functions. The character of a region has a strong impact on the direction and the pace of development of individual spheres of sustainable order. Research shows that regions with big urban areas have much higher economic and social points than non-industrialised areas. However, agricultural and tourist regions deal with environment problems better. That is why all actions concerning region development and meant to decrease disproportions have to depend on the type of region. The taxonomical analysis can be a base for further research.