When there are two or more data controllers who jointly determine the purpose and means of processing, they are considered joint controllers. They decide together to process personal data for a joint purpose. Joint controllership can take many forms and participation of the different controllers may be unequal. Joint controllers must therefore determine their respective responsibilities for compliance with the GDPR.

It is important to note that joint controllership leads to joint responsibility for a processing activity.

• Example of joint controllership:  Companies A and B have launched a co-branded product and wish to organise an event to promote this product. To that end, they decide to share data from their respective client and prospective client databases and decide on the list of invitees to the event on this basis. They also agree on the modalities for sending the invitations to the event, how to collect feedback during the event and follow-up marketing actions. Companies A and B can be considered joint controllers for the processing of personal data related to the organisation of the promotional event as they decide together on the jointly defined purpose and essential means of the data processing in this context.

More information:

• Data controller or data processor