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real-time software
subject			fact

real-time software	has definition Software that must react immediately to stimuli from the environment
	has concern safety
	has design issue responsiveness
	has purpose to operate special-purpose hardware such as embedded systems, industrial plants and telephone networks
	is a subtopic of 1.1 - The Nature of Software
	is a subtopic of 10.5 - Defects in Timing and Co-Ordination: Deadlock, Livelocks and Critical Races
	is a kind of software
software	can be easily duplicated
	can have usability without utility^2
	can have utility without usability
	deteriorates as it is changed repeatedly
	does not wear out with use like other engineering artefacts
	has quality which is only as good as its lowest-quality reusable component
	is hard to change correctly
	is intangible
	is more reliable if it has fewer failures
	is designed usually for human beings to use
	must be designed with users' input otherwise it may not be usable
	often has a poor design and is steadily becoming worse

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