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subject > criterion > quality > software quality > external software quality > usefulness > usability > high usability

high usability
subject			fact

high usability	is a subtopic of 1.5 - Software Quality
	is a kind of usability
	may require adding extra code to provide feedback to the users, which might in turn reduce overall efficiency
usability	has part acceptability
	has part efficiency of use
	has part error handling
	has part learnability
	is important
usefulness	consists of utility^2 and usability
	is measured in the context of particular types of users
external software quality	can be observed by stakeholders
	has a direct impact on stakeholders