Policy decisions are influenced by many factors, from the ideology of the policymaker and their advisors to political expediency. Most would also agree that key political decisions should be evidence-based. However, this is easier said than done. Understanding what evidence policymakers need, and how they should evaluate this, is key for more robust decision-making.

The importance of the EU in global governance has been well researched. However, systematic analysis of the way it interacts with other international organisations has been side-lined. To address this gap, Axel Marx the University of Leuven and Oliver Westerwinter at the University of St. Gallen introduce a special issue of the Journal of European Integration. The research published in this issue explores how the EU interacts with different types of global governance institutions.

Migrants travel hopefully, dreaming of better lives. Some are successful, some less so. Many in both groups ultimately decide to return to their home country. Dr Tony Ward, a University of Melbourne historian, is himself a migrant, and descended from a family that returned from Australia. He sought out other stories of return migration from Australia to the UK in the 19th Century. His studies shed light on more general questions. How many migrants return? Which migrants are more likely to make the trip home? And why?