Social interactions that are a response to unstructured, ambiguous, or unstable situations are called social movements.

Sociologists use the terms "mob" and "crowd" interchangeably.

Riots, mobs, and acting crowds are either violent or have the potential for violence.

Many riots are started by rumors.

Natural disasters usually result in panics.

Social movements occur when people perceive that things are getting worse for them.

The charismatic movement that is currently occurring among Catholics and Protestants is an example of a resistance movement.

Emergent norm theory argues that crowd unity develops from the like-mindedness of members.

Institutional ecology is that faction of the environmental movement that consists mainly of formal organizations funded by independent financial contributions with a combination of professional staffs and volunteer workers.

People resist change because they are afraid that they will lose something they value.

Today, the Civil Rights Movement has become an institutionalized part of American society.

Solidaristic crowds are usually violent.

According to Smelser's structural strain theory, collective behavior is more likely to occur when the agencies of social control are indecisive and fail to act swiftly and firmly.

Organizations are most effectively changed when the rate of members' participation in the organization is high.

According to McAdam and Marx, nationalistic ethnic movements will increase around the world in the twenty-first century.