Chapter 1 Introduction.- Chapter 2 Of Principals, Agents, and Constraints.- Chapter 3 Methods and Data.- Chapter 4 How do National Parties Try to Influence Voting Behavior in Council and EP?.- Chapter 5 How do Institutional Constraints Shape Voting Bahavior in Bicameral EU Decision-Making?.- Chapter 6 Voting Unity between Ministers and MEPS of the Same National Party.- Chapter 7 Are National Parties Able to Ensure Cohesive Voting Behavior of their Representatives in the EU?.- Chapter 8 Conclusion.