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Introduces the important topic of critical systems

Introduces the important topic of critical systems

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  • The effective functioning of our personal lives, society and economy is now dependent on software-intensive systemsMany of these systems are critical systems – systems where failure or lack of availability has a serious human, environmental or economic effect.Examples of critical systemsControl systems for complex equipment, such as an aircraft flight control systemInfrastructure systems that manage national infrastructure (power, water, telecommunications, railways, etc.)Healthcare systems that manage patient informationAlso give examples of non-critical systems e.g. games, PC applications,

Critical systems intro Presentation Transcript

  • 1. Critical systems video, 2013 Slide 1 Critical systems
  • 2. Critical systems video, 2013 Slide 2 Critical system essentials Reliability The system must operate without serious failures Availability The system must be available to deliver services when requested to do so Safety The system should not harm people or the system’s environment Security The system must be able to protect itself and its data from malicious use
  • 3. Critical systems video, 2013 Slide 3 Critical system essentials Safety The system should not harm people or the system’s environment
  • 4. Critical systems video, 2013 Slide 4 Critical system essentials Reliability The system must operate without serious failures
  • 5. Critical systems video, 2013 Slide 5 Critical system essentials Availability The system must be available to deliver services when requested to do so
  • 6. Critical systems video, 2013 Slide 6 Critical system essentials Security The system must be able to protect itself and its data from malicious use
  • 7. Critical systems video, 2013 Slide 7 Dependability Reliability The system must operate without serious failures Availability The system must be available to deliver services when requested to do so Safety The system should not harm people or the system’s environment Security The system must be able to protect itself and its data from malicious use
  • 8. Critical systems video, 2013 Slide 8 Classes of critical system • Safety-critical systems – Failure results in loss of life, injury or damage to the environment e.g. chemical plant protection system; • Mission-critical systems – Failure results in failure of some goal- directed activity e.g. spacecraft navigation system;
  • 9. Critical systems video, 2013 Slide 9 Classes of critical system • Business-critical systems – Failure results in high economic losses e.g. customer accounting system in a bank; • Infrastructure systems – Failure results in a loss of infrastructure capability e.g. power distribution control system, broadband communications, etc.
  • 10. Critical systems video, 2013 Slide 10 Critical systems stack Physical infrastructure Infrastructure systems System hardware Operating system and middleware External systemsCritical system X
  • 11. Critical systems video, 2013 Slide 11 Independent critical systems • Infrastructure/hardware is part of the system • System operation is not dependent on external systems • Embedded control systems such as those in medical devices
  • 12. Critical systems video, 2013 Slide 12 Critical software systems • Usually rely on commodity hardware/OS • System operation is dependent on external infrastructure provision • Hospital appointments system
  • 13. Critical systems video, 2013 Slide 13 Systems of systems • A critical system is rarely a single system but is a network of several software-intensive systems as well as infrastructure systems
  • 14. Critical systems video, 2013 Slide 14 Systems of systems • Systems of systems (SoS) are complex socio-technical systems with – Different owners and management policies – Distributed operation – Heterogeneous hardware and software
  • 15. Critical systems video, 2013 Slide 15 Systems of systems • Individual systems may be part of several SoS so – Conflicting requirements from different uses of the system – Complex negotations may be required when system changes are to be made
  • 16. Critical systems video, 2013 Slide 16 Systems of systems • Systems that support organisational needs (e.g. an inter-bank payments system) have to be designed to be robust so that they can cope with failures and unavailability in the other systems on which they depend
  • 17. Critical systems video, 2013 Slide 17 Summary • Critical systems are usually systems of systems • Society depends on a range of critical systems from control systems to infrastructure systems • The more important characteristic of a critical system is its dependability, where dependability attributes are safety, reliability, availability and security
  • 18. Critical systems video, 2013 Slide 18 slideshare.com/so mmerville-videos