The field of mixed migration demands evidence-based programming. However, given the hidden, cross-border and mobile nature of mixed migration, gathering accurate data in this field is particularly challenging. This chapter builds on the experiences and lessons learned by the IOM’s Displacement Tracking Matrix (DTM) and the Mixed Migration Centre’s (MMC) Mixed Migration Monitoring Mechanism initiative (4Mi) during their data collection and analysis exercises carried out in the context of monitoring mixed migration across the Central and Western Mediterranean Routes. It elaborates on the ways in which the collected data have been used to inform internal programming of the organizations and, to the extent possible, of external actors. The chapter will also discuss how uses of the data can be improved by suggesting practical measures at different stages of the data management, information-sharing and coordination.