The network connectivity aspect of the IRM provides a significant advantage over traditional vulnerability assessment methods in that deactivation diagrams (fault trees) are only needed at the mission and system levels. The IRM simulator is able to determine the state of individual components, which eliminates the need to build extensive and complex deactivation diagrams for fluid, electrical, and other distributed systems. 
Integrated Recoverability Model™ (IRM)

 

Network Deactivation

System Network Deactivation Simplification

Traditional Deactivation examples


 
 This is a traditional deactivation diagram that models the power supply to End User 1, which can obtain power from Generator 2 through switchboard 2 or across the bus from Generator 1.


 
For this case,
traditional deactivation diagrams would model the power supply to End User 2, which obtains power from MBT1 (manual bus transfer).  The MBT has a normal and alternate source of power that trace back to Switchboard 1 and 2.  Because power can be obtained across the bus, there are four sources of power that would need to be modeled using traditional deactivation diagrams.