The ideological similarities between political parties in Europe are increasing which makes the future of politics unsure. We know from previous coalition research that parties which is ideologically similar to each other are more likely to form a coalition than parties with large ideological differences. Thus there is a lack of research which analyses ideology convergence within coalitions. The aim of this study is to examine the ideological convergence within the Alliance coalition in Sweden by analysing the differences and similarities before and after the Alliance creation in 2004. This study will investigate the political parties' liberal ideology convergence according to two ideal types, social liberalism and neoliberalism. This thesis are studying if and how the parties within the non-socialist Alliance coalition in Sweden, which ruled between 2006 and 2014, adjusted their ideology to each other in order to govern successfully. With a social constructivist approach, a textual content analysis of election manifestos from 2002 and 2010 will analyse the possible ideology convergence of the Alliance coalition. The result of this study is that two out of four parties made an ideology convergence when entering the coalition which made Social Liberalism to be the dominated ideology. With the use of Downs (1957) centripetal pattern a conclusion was drawn regarding stable long run coalitions in general. The Alliance coalition has demonstrated that parties within stable long run coalitions tend to converge their ideology towards the parties in the middle of the ideological spectrum. In the end, this thesis comes to the conclusion that parties which enters a stable, long run coalition and converge towards the middle as the Alliance coalition, risks to lose votes to new extreme parties which arises from the edges of the ideological spectrum.