v anglickém jazyce: This study focuses on the analysis of former Czech political project of "4-Coalition", which was established by four Czech oppositional parties (KDU-ČSL, US, ODA and DEU) in the years 1998 - 2002. This analysis is done through the case study, which focuses on the development of "4-Coalition" in its three developmental stages: from the cooperation of the sovereign parties, throw the formalized platform of party cooperation to the project of "4- Coalition" as a peculiar actor of the Czech politics. The analysis of ideological background, program and personnel questions shows the potential tensions, that arose inside of "4- Coalition", gives them in the appropriate historical context and analyses its causes. These tensions together with the external factors are viewed as a fundamental cause of the final failure of the project of "4-Coalition" and its disintegration. The aim of this study is to answer the question, whether it is possible in party system perspective to speak about "4-Coalition" as a potential third pole of the Czech party system, or whether it is anomaly, which the systemic tendency to the bipolar configuration doesn't infringe. With regard to the continuing relevance of only one left-right dimension of the party competition and the completion of the project of so...