Successful policy and measures aimed at human trafficking investigation, prevention and victim assistance require the collection of reliable data on the magnitude of the problem as well as trafficking patterns and trends. This paper examines the limitations in measuring human trafficking and how statistics usually over- or underestimate the phenomenon. Methodological and definitional issues and a failure to share and link data contribute to the knowledge gap and challenges to the collection of reliable data. The paper briefly addresses successful national, regional and international efforts at data collection and provides recommendations for effective and practical methods to enhance the collection of reliable data.

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