Controllers and processors

The guidance on this page is suitable for large businesses in the public, private and third sectors. Small businesses should use the resources on our small business web hub.

Brief guidance

Controllers and processors: a guide 

The definitions of 'controllers' and 'processors', how to determine if you are a controller or processor and what the roles are.  

Detailed guidance 

Controllers and processors 

More detailed guidance on controllers and processors, including how to apply the roles in practice, your responsibilities under each role and joint controllers.  

Resources 

Controllers self assessment

Assess your high level compliance with data protection legislation, as a data controller.

Processors self assessment 

Assess your high level compliance with data protection legislation, as a data processor.