Assessment and Integration of Software Risk within PRA
Volume 3, Number 3, July 2007 - Paper 7 - pp. 369 -378
MICHAEL YAU, MAJID MOTAMED and SERGIO GUARROASCA, Inc., Redondo Beach, CA 90277, USA
(Received on October 10, 2006)
This paper describes a software risk assessment approach based on the software conditional risk concept recommended in the PRA Procedure Guide for NASA Managers and Practitioners. This concept is used with the Dynamic Flowgraph Methodology analytical tool and risk-based software test strategies. The input space of the software is subdivided into a set of "contexts" corresponding to operating environments and functional conditions for the space system controlled by the software. The formulation of a "conditional risk index" that expresses critical software risk in terms of "condition coverage" is then enabled with a combination of DFM modeling/analysis and software defect rate estimation techniques.
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