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80-20 rule (Pareto principle)
subject			fact

80-20 rule	has definition A rule that states that 80% of the benefit can often be obtained with 20% of the work; the remaining 20% of the benefit then takes 80% of the work
	has purpose to justify cutting less important requirements to significantly reduce costs
	is a subtopic of 4.8 - Reviewing Requirements
	is an instance of rule
	states that 80% of the benefit can often be obtained with 20% of the work; the remaining 20% of the benefit then takes 80% of the work
	is a synonym of Pareto principle