This handbook is a practical tool to guide the implementation of victim-centered and trafficker-centered databases. This handbook was developed in the context of achieving regional criteria for countries in South East Europe. Part 1 outlines information relevant to this data collection project – particularly the objectives and framework of the work. Part 2 maps out the data collect methodology and relevant legal and ethical issues as well as reporting obligations. The handbook then (in parts 3 and 4) provides step-by-step guidance in terms of each type of database being implemented under the project, including a detailed description of each indicator. Part 5 discusses issues related to data quality and analysis, while part 6 provides resources on data collection as well as information about data collection initiatives in Europe by governments and international organizations. Part 7 provides the practical tools (i.e. MOUs, glossary, consent forms, confidentiality agreement and question templates) for the implementation of data collection according to the developed criteria.