TAILIEUCHUNG - Lecture Software engineering: Chapter 12 – Safety Engineering

Chapter 12 – Safety Engineering. These lectures discuss different issues related to software configuration management. In this chapter, the following content will be discussed: Component-level testing, navigation testing, configuration testing, security testing, performance testing. | Chapter 12 – Safety Engineering 04/11/2014 Chapter 12 Safety Engineering 1 Topics covered Safety-critical systems Safety requirements Safety engineering processes Safety cases 04/11/2014 Chapter 12 Safety Engineering 2 Safety Safety is a property of a system that reflects the system’s ability to operate, normally or abnormally, without danger of causing human injury or death and without damage to the system’s environment. It is important to consider software safety as most devices whose failure is critical now incorporate software-based control systems. 3 Chapter 12 Safety Engineering 04/11/2014 Software in safety-critical systems The system may be software-controlled so that the decisions made by the software and subsequent actions are safety-critical. Therefore, the software behaviour is directly related to the overall safety of the system. Software is extensively used for checking and monitoring other safety-critical components in a system. For example, all aircraft engine components are monitored by software looking for early indications of component failure. This software is safety-critical because, if it fails, other components may fail and cause an accident. 04/11/2014 Chapter 12 Safety Engineering 4 Safety and reliability Safety and reliability are related but distinct In general, reliability and availability are necessary but not sufficient conditions for system safety Reliability is concerned with conformance to a given specification and delivery of service Safety is concerned with ensuring system cannot cause damage irrespective of whether or not it conforms to its specification. System reliability is essential for safety but is not enough Reliable systems can be unsafe 5 Chapter 12 Safety Engineering 04/11/2014 Unsafe reliable systems There may be dormant faults in a system that are undetected for many years and only rarely arise. Specification errors If the system specification is incorrect then the system can behave as specified but still cause an .

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