The cross-border cooperation helps to overcome barriers between nations and provides opportunities for people who live on both sides of the border. It helps to overcome mutual stereotypes and suspicious which usually arise between people who live on both sides of the border. Moreover, above mentioned cooperation helps to promote the regional economy, and foster linkages with the European Union. Poland being a Member State of the European Union and a democratic law-governed state accepted a set of obligations which authorizing Polish tiers of local self-government to cooperate with entities from other countries. Until very recently the most popular form of the cross-border cooperation in Poland were assosiations, i.e. agreements sides of Euroregions functioning on Poland borders. However, in 2008 was passed the Act on European grouping of territorial cooperation. Shortly before that, the resolution on European grouping of territorial cooperation was passed by the European Union.