until there is just the IC role remaining. Span of control To limit the number of responsibilities and resources being managed by any individual, the ICS requires that any single person's span of control should be between three and seven individuals, with five being ideal. In other words, one manager should have no more than seven people working under them at any given time. If more than seven resources are being managed by an individual, then that individual is being overloaded and the command structure needs to be expanded by delegating responsibilities (e.g. by defining new sections, divisions, or task forces). If fewer than three, then the position's authority can probably be absorbed by the next highest rung in the chain of command. Coordination One of the benefits of the ICS is that it allows a way to coordinate a set of organizations who may otherwise work together sporadically. While much training material emphasizes the hierarchical aspects of the ICS, it can also be seen as an inter-organizational network of responders. These network qualities allow the ICS flexibility and expertise of a range of organizations. But the network aspects of the ICS also create management challenges. One study of ICS after-action reports found that ICS tended to enjoy higher coordination when there was strong pre-existing trust and working relationships between members, but struggled when authority of the ICS was contested and when the networks of responders was highly diverse. Coordination on any incident or event is facilitated with the implementation of the following concepts: Incident Action Plans Incident action plans (IAPs) ensures cohesion amongst anyone involved toward strictly set goals. These goals are set for specific operational periods. They provide supervisors with direct action plans to communicate incident objectives to both operational and support personnel. They include measurable, strategic objectives set for achievement within a time frame (also known as an operational period) which is usually 12 hours but can be any length of time. Hazardous material incidents (hazmat) must be written, and are prepared by the planning section, but other incident reports can be both verbal and/or written. The consolidated IAP is a very important component of the ICS that reduces freelancing and ensures a coordinated response. At the simplest level, all incident action plans must have four elements: What do we want to do? Who is responsible for doing it? How do we communicate with each other? What