A Retrospective Safety Case for an Advanced Driller's Cabin using the Goal Structuring Notation (GSN)

Abstract

TX 75083-3836, U.S.A., fax +1-972-952-9435. AbstractWe used the Goal Structuring Notation (GSN) to construct a retrospective safety case for a driller's cabin on an offshore drilling rig for the purpose of demonstrating that a retrospective approach can be applied to identify, assess and structure available solutions or evidence. We also evaluated the development process aspects of constructing the safety case retrospectively. Our results showed that a retrospective safety case can be constructed based solely on existing evidence. The retrospective approach did however lead to a stronger focus on fitting the arguments to the evidence and weakening the focus on constructing solid argument structures. Nevertheless, the safety case provided an argument structure supporting diverse evidence.