This handbook is intended for the government institutions responsible for the collection, analysis and presentation of victim-centered data and trafficker-centered criminal justice data. It provides the practical tools needed to collect the two data sets and provides an overview of the victim-centered and the trafficker-centered criminal justice data sets – including the range of information to be collected; standardized methodologies and data collection processes; and common terminology for collecting this information from a wide range of data sources. The handbook also aims to equip national data repositories with some basic skills in the collection, analysis and presentation/dissemination of data sets, in accordance with legal, security and ethical parameters at a national and EU level. The handbook offers guidelines to be adapted at a national level in response to the national context and individual country’s needs.