Pareto's Principle: the 80/20 Rule (aka Pareto's law) - by Economist Vilfredo Pareto (sometimes misspelled Wilfedo Pereto, Vilfredo Paredo, or Vilfredo Paretto)

Zeigarnik Effect

History

Identified by the Russian psychologist B Zeigarnik (1900- ).

The psychology concept called the Zeigarnik effect refers to the phenomenon whereby the recall ratio for tasks interrupted at the middle or latter end of task completion is higher than for tasks interrupted at or near the beginning. Other research has indicated that: (1) the Zeigarnik effect is likely to appear if the subject is ego-involved in the task to some extent; (2) the effect is more likely to appear if the task doesn't seem to be part of the experimental game-plan; (3) the effect is most likely to appear if the subject has set a genuine level of aspiration in the interrupted task.

A D Baddeley, The Psychology of Memory (New York, 1976)

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