WP29 guidelines for identifying a controller or processor’s lead supervisory authority

These guidelines from the Article 29 Working Party provide clarification on the key concepts of identifying a lead supervisory authority and how to interpret the specific wording of the requirements in the GDPR. (Issued December, 2016, and revised April 5, 2017)
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The WP29 published in December 2016 a complementary FAQs on identifying a lead supervisory authority here.