Which one of the following would be the MOST useful in helping to define roles and responsibilities in an organizational structure?

RACI stands for Responsible, Accountable, Consulted, and Informed, and is a matrix used to clarify who does what in a process or organizational structure. It eliminates ambiguity by explicitly assigning one of these four roles to each stakeholder for every activity or decision, making it the most direct tool for defining responsibilities.

An incident model defines the steps to handle a specific type of incident, not organizational roles and responsibilities broadly.

The CSI approach is a seven-step improvement model focused on measuring and improving services, not on assigning organizational roles.

The Deming Cycle (Plan-Do-Check-Act) is a quality improvement methodology, not a tool for defining roles and responsibilities.