For those who seek to understand today’s social movements, and those who wish to amplify them, questions about how to evaluate a campaign’s success and when it is appropriate to declare victory remain as relevant as ever. To them, Gandhi’s may still have something useful and unexpected to say. That the Salt March might at once be considered a pivotal advance for the cause of Indian independence and a botched campaign that produced little tangible result seems to be a puzzling paradox. But even stranger is the fact that such a result is not unique in the world of social movements. Martin Luther King Jr.’s landmark 1963 campaign in Birmingham, Ala., had similarly incongruous outcomes: On the one hand, it generated a settlement that fell far short of desegregating the city, a deal which disappointed local activists who wanted more than just minor changes at a few downtown stores; at the same time, Birmingham is regarded as one of the key drives of the civil rights movement, doing perhaps more than any other campaign to push toward the historic Civil Rights Act of 1964.