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efficiency of use
subject			fact

efficiency of use	has definition A measure of how fast an expert user can do their work using the system
	is a subtopic of 7.4 - The Basics of User Interface Design
	is concerned with ordinary use
	is measured as the total number of instances of a small task that a user can do per hour, or the total time required to do a certain large task
	is a kind of measurement
	is a kind of software quality
	measures how fast an expert user can do their work using the system
software quality	is hard to assess