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The “3.5% rule” refers to the claim that no government has withstood a challenge of 3.5% of their population mobilized against it during a peak event. In this brief paper, author Erica Chenoweth addresses some of the common questions about the 3.5% rule, as well as several updates from more recent work on this topic.

Four key takeaways are as follows:
 

• The 3.5% figure is a descriptive statistic based on a sample of historical movements. It is not necessarily a prescriptive one, and no one can see the future. Trying to achieve the threshold without building a broader public constituency does not guarantee success in the future.

• The 3.5% participation metric may be useful as a rule of thumb in most cases; however, other factors—momentum, organization, strategic leadership, and sustainability—are likely as important as large-scale participation in achieving movement success and are often precursors to achieving 3.5% participation.

• New research suggests that one nonviolent movement, Bahrain in 2011-2014, appears to have decisively failed despite achieving over 6% popular participation at its peak. This suggests that there has been at least one exception to the 3.5% rule, and that the rule is a tendency, rather than a law.

• Large peak participation size is associated with movement success. However, most mass nonviolent movements that have succeeded have done so even without achieving 3.5% popular participation.