Final answer:
In the context of NIMS, a group is any collection of at least two people who frequently interact and share a sense of aligned identity.
Step-by-step explanation:
The National Incident Management System (NIMS) defines a group as 'any collection of at least two people who interact with some frequency and who share some sense of aligned identity'. This implies that a group must have a sense of cohesion and a shared identity, whether temporary or permanent. Groups can form under various circumstances, including work, social activities, hobbies, or even as a result of emergency situations where individuals come together for mutual support.