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The famous 1918 story where Bethlehem Steel president Charles Schwab paid productivity consultant Ivy Lee $25,000 (equivalent to $400,000 in 2015) after three months of using the six-task prioritization method.

Time management principle stating that 10% of activities produce 90% of outcomes. This rule, also known as the Pareto Principle applied to time, encourages identifying and prioritizing high-impact tasks while eliminating or delegating low-value work.

A productivity principle stating that 10% of your actions account for 90% of your outcomes, related to the Pareto Principle but specifically applied to daily activity selection, suggesting strategic focus on the highest-impact 10% of possible tasks.

Critical recognition that being busy doesn't equal being productive. Busyness involves constant activity and filled schedules, while productivity focuses on meaningful outcomes and results. Distinguishing between them is the first step toward time mastery, emphasizing intentional work over activity theater.

Principle stating that 80% of results come from 20% of efforts. Applied to time management by identifying and focusing on the vital few activities that produce most of your desired outcomes.