Which three (3) levels are Management activities of Incident Management Structure (IMS) ?

The Incident Management Structure (IMS) is a framework for organizing and managing the response to a disruptive incident. The IMS defines three levels of management activities: strategic, tactical, and operational. The strategic level is responsible for setting the overall direction and objectives of the response, as well as allocating resources and coordinating with external stakeholders. The tactical level is responsible for implementing the strategic decisions and managing the operational teams. The tactical level also monitors the situation and reports to the strategic level. The operational level is responsible for executing the specific tasks and actions required to achieve the objectives of the response. The operational level also provides feedback to the tactical level on the progress and issues encountered. References:

ISO 22301 Auditing eBook, Chapter 4: Incident Response and Recovery, Section 4.2: Incident Management Structure1

ISO 22320:2018(en), Security and resilience — Emergency management — Guidelines for incident management2