The great majority of EU member states currently use, or have used in the last decade, some sort of regularisation measure. Yet regularisation is also a highly contested policy tool, raising a range of issues regarding the effectiveness of regularisation measures: the economic, fiscal and social impact of such measures, the extent to which regularisations exert a pull effect on irregular migration and the relationship of regularisation with other policies on irregular migration, notably prevention and return. REGINE - Regularisations in Europe addresses these debates surrounding regularisation. Apart from comprehensively documenting and analysing patterns of regularisation in the eu-27, it investigates possible rationales for regularisation, the impact of regularisation and the relationship of regularisation to the wider policy framework on migration and asylum.