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high efficiency
subject			fact

high efficiency	is a subtopic of 1.5 - Software Quality
	is a kind of efficiency
	may cause a design to be less easy to understand, which may reduce maintainability, which in turn leads to defects that reduce reliability
	may require avoiding extra code to provide feedback to the users which reduces usability
	may require not checking for errors and avoiding redundant computations which reduces reliability
efficiency	is important to customers in order to reduce their costs of running the software
	is constrained by software architecture
	measures how much CPU-time, memory, disk-space, network bandwidth or other resources software uses
external software quality	can be observed by stakeholders
	has a direct impact on stakeholders