Bilateral migration agreements (BMAs) have become one of the most popular policy tools formigration control. Whether it be bilateral labor agreements (BLAs) or other types of BMAs, they have increasingly been signedin the last decades. The introduction to this book elucidates why these instruments of migration control warrant a closer look.It introduces various types of BMAs and reasons behind their signing before turning to how this book intends to answer thequestion whether their signing may be directly related to a country's seeking of ontological security and why.