Between 1900 and 2006 nonviolent campaigns against authoritarian regimes were twice as likely to be successful as violent ones. Nonviolent campaigns also increase the likelihood that a peaceful, democratic government will emerge. Three characteristics of successful nonviolent campaigns are that they draw widespread and diverse participation, they elicit defections from the regime, and they employ flexible tactics. Spontaneous nonviolent campaigns are rarely successful; planning and coordination are required. Outside countries are often at a loss to know how best to support nonviolent movements for change. People within those movements know best what, if anything, from the outside could be useful (Foreign Affairs, July/August).