Which of the following models would be MOST usefulin helping to define roles andresponsibilities in an organization structure?

The RACI model is a responsibility assignment matrix in ITIL that categorizes involvement as Responsible, Accountable, Consulted, or Informed for each process activity. It is the primary ITIL tool for eliminating ambiguity in who owns and performs tasks across organizational structures and service management processes.

An incident model defines the predefined steps and escalation paths for handling a specific category of incident, not for assigning organizational roles.

The CSI model provides a seven-step process for identifying and implementing service improvements, not for defining who holds which responsibilities.

The Deming Cycle is a quality management improvement framework focused on iterative process improvement, not on defining organizational accountability.