At the same time as the European Union’s (EU) influence has grown, path-breaking changes in Sweden’s social policy characteristics have appeared. Previous research gives contradictory evidence on whether and how these developments relate, and it remains unknown to what extent the EU contributed to the changes observed in Sweden.  By operationalising four theories on the mechanisms of social policy change (institutionalism, power resources approach, new politics, and new social risks), using the EU as a driving force, and two diverging policy developments as outcomes, this thesis cast the net wider than previous research and applies process tracing methods to a selection of 339 policy documents to answer: (i) How has Europeanisation affected unemployment policy and family policy in Sweden, 1990- 2019? (ii) To what extent can Europeanisation sufficiently explain the retrenchment in unemployment policy while family policies were expanded in the same period of time?  I find no support for the mechanisms of institutionalism and new politics, limited support for new social risk, and mixed support for the power resource approach explaining the Europeanisation of Swedish social policy. Although I found empirical support for parts of several, I conclude that no theory can sufficiently explain the complete causal chain of how the EU influence the two Swedish policy outcomes.