Book excerpt: Issues of social justice have been an important part of social psychology since the explosion of psychological research that occurred during and after World War II. At that time, psychologists began to move away from earlier theories that paid little attention to people's subjective understanding of the world. As increasing attention was paid to people's thoughts about their social experiences, it was discovered that people are strongly affected by their assessments of what is just or fair in their dealings with others. This recognition has led to a broad range of studies exploring what people mean by justice and how it influences their thoughts, feelings, and behaviors.