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good software
subject			fact

good software	is a subtopic of 1.1 - The Nature of Software
	is easy to modify
	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