Critical systems video, 2013 Slide 1
Critical systems
Critical systems video, 2013 Slide 2
Critical system essentials
Reliability
The system must operate without
serious failur...
Critical systems video, 2013 Slide 3
Critical system essentials
Safety
The system should not harm
people or the system’s
e...
Critical systems video, 2013 Slide 4
Critical system essentials
Reliability
The system must operate
without
serious failur...
Critical systems video, 2013 Slide 5
Critical system essentials
Availability
The system must be available
to deliver servi...
Critical systems video, 2013 Slide 6
Critical system essentials
Security
The system must be able to
protect itself and its...
Critical systems video, 2013 Slide 7
Dependability
Reliability
The system must operate without
serious failures
Availabili...
Critical systems video, 2013 Slide 8
Classes of critical system
• Safety-critical systems
– Failure results in loss of lif...
Critical systems video, 2013 Slide 9
Classes of critical system
• Business-critical systems
– Failure results in high econ...
Critical systems video, 2013 Slide 10
Critical systems stack
Physical infrastructure
Infrastructure systems
System hardwar...
Critical systems video, 2013 Slide 11
Independent critical systems
• Infrastructure/hardware is part of
the system
• Syste...
Critical systems video, 2013 Slide 12
Critical software systems
• Usually rely on commodity
hardware/OS
• System operation...
Critical systems video, 2013 Slide 13
Systems of systems
• A critical system is rarely a
single system but is a network
of...
Critical systems video, 2013 Slide 14
Systems of systems
• Systems of systems (SoS) are
complex socio-technical systems
wi...
Critical systems video, 2013 Slide 15
Systems of systems
• Individual systems may be part of
several SoS so
– Conflicting ...
Critical systems video, 2013 Slide 16
Systems of systems
• Systems that support organisational
needs (e.g. an inter-bank p...
Critical systems video, 2013 Slide 17
Summary
• Critical systems are usually systems of
systems
• Society depends on a ran...
Critical systems video, 2013 Slide 18
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Critical systems intro

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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

    1. 1. Critical systems video, 2013 Slide 1 Critical systems
    2. 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. 3. Critical systems video, 2013 Slide 3 Critical system essentials Safety The system should not harm people or the system’s environment
    4. 4. Critical systems video, 2013 Slide 4 Critical system essentials Reliability The system must operate without serious failures
    5. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 18. Critical systems video, 2013 Slide 18 slideshare.com/so mmerville-videos
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