I was the Project Manager and document owner/creator for a GDPR compliance project. The context was a SaaS provider wishing to ensure GDPR compliance for their commercial platforms and to provide customer documentation.
The project took approximately 1 year and was completed with the help of the development, solution architects, support and Group legal teams.
This is a page from the document index.
This is a sample context diagram from a document created for one of the SaaS platforms to assist with risk identification and mitigation: