Recent white papers by Nancy Leveson:
Nancy Leveson, Improving the Standard Risk Matrix: Part 1, February 2019
The Risk Matrix is widely used but has many limitations. This white paper describes the problems with the standard Risk Matrix and how to improve the results obtained by using it. A second part is in preparation that suggests a change to the Matrix and the standard definition of risk.
Nancy Leveson, An Engineering Perspective on Avoiding Inadvertent Nuclear War, January 2019:
Written for a workshop on Nuclear Command, Control, and Communication Systems and Strategy Stability.