The drive for flexibility was already a fait accompli at a bilateral level, long before the entry into force of the 1999 Treaty of Amsterdam which empowered the Union to negotiate and conclude formal EU readmission agreements with third countries. This chapter sets out to demonstrate that the drive for flexibility has also become a fait accompli at the EU level, seven years after the 2009 entry into force of the Treaty of Lisbon. The implications stemming from the drive for flexibility are critically examined with reference to the various EU domestic factors that motivated the European Commission.