Jochen Oltmer 
The Borders of the EU [PDF ebook] 
European Integration, ‘Schengen’ and the Control of Migration

This  book looks at the background to the policy of free movement in Europe and discusses the consequences. European integration changed migration conditions considerably: Under the concept of ‘freedom of movement’, border crossings between EU member states as well as work and settlement by nationals of other member states were largely facilitated; internal borders thus lost their significance. At the same time, the question of how to deal with a common external border and the migration of ‘third-country nationals’ gained in importance. The essential explains why migration from outside Europe was increasingly understood as a problem of security policy and why this still determines the measures for designing a common external border today.

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