This collection of essays brings together contributions from judges, legal scholars and practitioners in order to provide a comprehensive assessment of the law and practice of exceptions from the principle of free movement. It aims: - to conceptualise how justification arguments relating to exceptions to free movement operate in the case law of the Court of Justice of the European Union and national courts; - to develop a comprehensive and original account of empirical problems on the application of proportionality; - to explore the legal and policy issues which shape the interactions between...