By Ian Sommerville (auth.), Felix Redmill, Tom Anderson (eds.)
Current matters in Safety-Critical platforms includes the invited papers awarded on the 11th annual Safety-critical platforms Symposium, held in February 2003. The safety-critical platforms area is speedily increasing and its commercial difficulties are regularly applicants for tutorial learn. It embraces just about all sectors; present matters in a single are normally acceptable to others. The Safety-critical procedure Symposium presents an annual discussion board for discussing such matters. The papers contained inside this quantity hide a vast diversity of topics. They signify loads of commercial adventure in addition to a few educational study. the entire papers are associated by way of addressing present matters in safety-critical structures: Dependability specifications Engineering; Human mistakes administration; affects on probability; protection circumstances; Reforming the legislations; security administration and defense Standards.
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Extra info for Current Issues in Safety-Critical Systems: Proceedings of the Eleventh Safety-critical Systems Symposium, Bristol, UK, 4–6 February 2003
Sample text
Although Predictive TRACEr has been developed only recently, preliminary indications of its capabilities are promising. One study found that Predictive TRACEr enabled the identification of 94% of human errors that later occurred during the simulation of the system (Shorrock, 1999). RAZOP component Intention Statement Guideword Deviation Cause(s) Consequence System Indication System Defence Human Recovery HAZARD or Question To find a predicted breach interaction using the tool. Late Controller finds the breached interaction too late Distraction Filtering will not show traffic which is not the present sector's responsibility, which may become own responsibility too late Traffic not co-ordinated into sector Late or non resolution of conflict Interaction alert when first ale transferred Interaction Alert at 5 minutes and 2 minutes.
Various approaches were investigated and BNs were chosen as the most suitable way of achieving this objective. With this decision work progressed on the EC funded SERENE project (1996-1999) [Fenton 1999] to develop a method for representing safety arguments using BNs. The results from this project included a fully developed method, a supporting tool for the method and a number of case studies. Since then numerous other EPSRC funded research projects, for example IMPRESS [Neil et al 1996] and SCULLY [Fenton Neil 2001] have contributed to the development of this technology.
In deciding what to do, the human accesses both long-term and working memories for relevant information to inform the decision-making process. Once a decision is made, the human then takes action to carry out the decision. Perception Figure 3. Human information processing model (adapted from Wickens, 1992). 27 Human error can arise from a breakdown in any of these processes. For example: • Perception - misperceive or fail to perceive information correctly. • Decision -an error of judgement, planning or decision-making can occur.
