incorporating the ability to draw, edit, and analyze graphical event trees.

1990 Analysis improvements to IRRAS led to the release of Version 4 and the formation of the IRRAS Users Group.

1992 Creation of 32-bit IRRAS, Version 5, resulted in an order-of-magnitude decrease in analysis time. New features included: end state analysis; fire, flood, and seismic modules; rule-base cut set processing; and rule-based fault tree to event tree linking.

1997 SAPHIRE for Windows, version 6.x,

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