 IUM is pleased to launch its Counter-Trafficking and Emergencies Information Management Guide. Information management on human trafficking in crisis context faces a dual challenge of conducting data collection and analysis in complicated operating environments, and quantifying a hidden phenomenon, a crime, that is often blurred with other human rights violations. This guide aims to address this dual challenge with the purpose to promote an evidence-based decision-making approach that supports the development of new interventions or the adoption of existing measures to more systematically integrate counter-trafficking prevention and response in humanitarian contexts. This guide is based on decades-long history of IUM in counter-trafficking and migrant protection, together with extensive experience in operational response across emergency contexts. The guide is also the result of extensive engagement with external partners and stakeholders, particularly with the members of the Interagency Coordination Group against Trafficking in Persons and of the Global Protection Cluster Anti-Trafficking Task Team. This guide is intended for a broad audience, but primarily addresses information management experts and protection practitioners at a field level, aiming to foster cooperation and to jointly support decision-making. We believe that this guide will be useful to all working humanitarian responses in understanding trafficking in persons and in further integrating counter-trafficking interventions in current responses.