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usefulness
subject			fact

usefulness	consists of utility^2 and usability
	has definition The extent to which a system can be used to perform a task; combines usability and utility^2
	is essential
	is a subtopic of 7.4 - The Basics of User Interface Design
	is measured in the context of particular types of users
	is a kind of external software quality
	is a kind of measurement
external software quality	can be observed by stakeholders
	has a direct impact on stakeholders

Kinds of usefulness :

• usability (1 kind, 8 facts) - An important quality of software that measures the extent to which a product or process is learnable, enables users to be productive and avoid errors, and also subjectively satisfies them (in contrast to utility^2)
• utility^2 (4 facts) - The extent to which, independent of usability, a product or process provides capabilities needed to solve a customer's problem