The PHAEDRA project (Improving Practical and Helpful cooperAtion bEtween Data PRotection Authorities) analysed the state-of-the-art of the initiatives of supervisory authorities to improve international cooperation and coordination among them. The partners interacted with supervisory authorities via interviews, surveys and workshops, and advised policy-makers and supervisory authorities themselves how to improve their practical cooperation and coordination, in parallel raising awareness about the problem at stake.