What describes one of the two basic approaches to using ICS?

The choice regarding reacting to an unplanned incident accurately reflects one of the fundamental approaches to using the Incident Command System (ICS). ICS is designed to provide a scalable and organized framework for managing incidents of varying complexity and nature. Reacting to an unplanned incident is a core principle of ICS, emphasizing its utility in rapidly assessing and addressing emergent situations where there is little to no prior planning or notification of the event.

The system is structured to facilitate immediate response and adaptation to unforeseen circumstances, allowing for quick mobilization of resources and personnel. This approach ensures that responders can effectively manage the incident dynamics as they evolve, utilizing established protocols and communication structures to maintain situational awareness and coordination.

In essence, the flexibility of ICS to handle unplanned incidents is a key characteristic that enables organizations to respond effectively, ensuring public safety and resource deployment aligns with the incident's demands.