Writing a dissertation is a search for yourself. As in Franz Schubert's song Der Wegweiser 1 , the researcher avoids roads which other travelers used to go, but searches out the hidden pathways. Sometimes through snowy mountain tops, sometimes traveling a street from which no one ever returned. You do not know when and where to end. Which desire drives the researcher into the wilderness, wandering ever further without rest? Probably to find out the truth in a world of humans, nature and science. Science also reflects the truth of its time. The last years at the University of Twente comprise a period in which the nationwide referendum has been introduced in the Netherlands and is-almost-withdrawn. After having graduated from Maastricht University, I was grasped by the challenge to do more fundamental research. Even before his research group Law on Europe was officially established within Zuyd University of Applied Sciences, Eric van de Luijtgaarden invited me to take part in research discussions, to brainstorm about a suitable topic and to look for a potential supervisor. After some time, governmental action in EU-related referendums turned out to be the niche topic. In May 2012, Kees Aarts and Henk van der Kolk entrusted me to start as one of their PhD researchers at the University of Twente. During our first acquaintance, Kees envisaged that my subject of EU-related referendums would gain significance. He was right: the referendum became highly topical over the last five years. I had barely started my PhD research in autumn 2012, when in January 2013 former British Prime Minister David Cameron announced that the United Kingdom would hold an 'in or out' referendum on EU membership before the end 2017. The rest is history, still history in the making. How will Great Britain be able to rule the referendum outcome? I am most grateful to Kees, Henk and Eric for their outstanding guidance, always warm advice, and steady, patient and confident support during almost six years of supervision. Despite the distance to Enschede (or even Groningen), it was possible to arrange lengthy and well-prepared meetings, regularly after which I returned to Maastricht, always energized and with a lot of homework. Kees has been extremely stimulating in composing this thesis as is now, by suggesting how to build up the level of research and writing and to design the different theoretical frameworks into one coherent monograph. Henk has been very helpful in learning me the skills of well-structured and tight academic writing, modelling of causal inferences and very constructive and critical feedback on tables and figures. I have very much appreciated our intense discussions on draft chapters and papers. Eric enriched the discussions with the legal perspectives of this thesis. Though to count on Eric's enduring support how to maintain the balance between jobs in Twente and Limburg and between public and private life was at least as valuable. In this respect, Eric has been a true mentor. Fortunately, my research activities were not spatiall...