This whitepaper from BSI lays out the six stages of a data security or data privacy breach that incident response teams should follow to help detect and ultimately manage a data breach and provide remediation that can ensure an enhanced state of information resilience.
This document is available as part of the Cybersecurity Management Solution Pack.
It can also be accessed on the BSI Group Website: https://www.bsigroup.com/en-GB/topics/information-security/