“Common sense suggests that some factors in a [risk management] process are more important than others — and analysis supports this. In reality, only 20 percent of activities. In reality, only 20 percent of activities may account for up to 80 percent of results. This is known as Pareto's law, the “80/20 rule”…Pareto's law concentrates on the significant 20 percent and gives the less important 80 percent lower priority.”

—  Robert Heller

as cited in: William G. Ramroth, Jr. (2007) Risk Management for Design Professionals. p. 53
Making Decisions, (1998)

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British magician 1932–2012

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