Comparison of the cleavages development in the Czech Republic and Poland after 1989

The aim of the article is to identify cleavages that have been in Czech and Polish party system located since 1989. These cleavages are compared to determine the hierarchy and degree of their importance. It is also demonstrated the effort to determine the potential future development of the cleavages in these two countries. In this article as key for the formation of cleavages are considered elections to the lower houses of parliament. Elections to the upper houses of parliament and European elections are not relevant for the purpose of this work, because they are considered as second-order elections, thus they have no direct impact on the formation of cleavages.