Action against trafficking in human beings has become an important issue on the political agenda of the European Union and its Member States during the last decade. The design of effective measures (those that aim to foster prevention, protect victims and prosecute traffickers) has been commonly agreed to be built on appropriate legal and regulatory framework, research, data collection and information management. The lack of systematically collected and managed statistical data relevant to trafficking in human beings is one of the main obstacles to the successful and effective implementation of anti-trafficking policies and efforts. Objectives • To elaborate appropriate background information and on to assess the extent of different forms of trafficking in human beings in 17 EU Member States (Austria, Bulgaria, Belgium, the Czech Republic, Germany, Denmark, Spain, France, Hungary, Ireland, Italy, the Netherlands, Poland, Portugal, Romania, Sweden, United Kingdom). Outcomes • Comprehensive overview of national data on THB in the 17 EU countries covered • Comprehensive overview of national legislation on THB and related areas in the 17 EU countries covered • Comparative Analysis of assessed extent of different types of THB in the 17 EU countries covered • 17 Country Reports on national legislation, national statistics, and assessments of national developments in regard to the extent of THB in 17 countries covered. • Minimum and maximum scenarios on the total (17 countries) extent of different types of THB following the legal and administrative distinctions between victims and perpetrators but also between cases and persons on.