Networks, System Safety,

Embedded and Distributed Systems

Research Group of Prof. Peter Bernard Ladkin, Ph.D.

Embedded and Distributed Systems

Research Group of Prof. Peter Bernard Ladkin, Ph.D.

The output of a Why-Because Analysis is a Why-Because Graph. If the method is objective, it should be the case that different WB-Graphs prepared by different groups for the same incident should be very similar. The question arises how one can formally assess similarity of WB-Graphs.

- The paper Informeller Vergleich zweier Why-Because-Analysen [PDF,de] by Oliver Lemke (IfEV, T.U. Braunschweig) and Enrico Anders (Chair of Railway Signalling and Traffic Safety Systems, T.U. Dresden) compares two WB-Analyses of the same rail accident in order to derive some general comparison methods for Why-Because Analyses. The example was presented at the Bieleschweig Workshop 6.5 in Dresden on 29 November, 2005.
- The paper Checking and Comparison of WB-Graphs [PDF,en] by P. B. Ladkin gives some ways in which WB-Graphs can be assessed for similarity, with application to a pair of running examples.
- The paper Why-Because Analysis of the Glenbrook, NSW Rail Accident and Comparison with Hopkins's Accimap [PDF,en] by Peter B. Ladkin presents an explicit method for comparison of two WB-Graphs in course of a comparison of the Glenbrook collision in 1999. To aid the reader in following the comparison, the various graphs are reproduced in The Glenbrook Why-Because Graphs, Causal Graphs, and Accimap [PDF,en]