GDPoweR was a collaborative research project on industrial relations in the platform economy, involving seven organizations from five countries (Austria, Belgium, France, Poland, Spain). It focused on two sectors — ride-hailing and food delivery — and explored what worker data was collected by platform companies and how this affects workers, what strategies are used by social partners to negotiate and implement collective agreements, and how the implementation of such agreements can be monitored and enforced. A central method used was the recovery of worker data through GDPR requests and the joint analysis of this data by workers and researchers.