A good time management program with the proper balance of effectiveness and efficiency is typically based on a combination of the Pareto Principle, also known as the 80/20 Rule, and Parkinson's Law.
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When referring to time management, Pareto's Principle simply means that typically 80 percent of the desired results comes from 20 percent of the effort put in.
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By using the Pareto principle you learn to be more effective by choosing and prioritizing your tasks in the right order.
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This is known as the Pareto Principle, or the 80/20 rule, and means that in most instances you achieve 80 percent of the desired results from putting in 20 percent of the effort.