This chapter introduces our main research question: do constitutional rights make a difference? For instance, if a country constitutionalizes free speech, does that improve respect for free speech in practice? It also describes the research methods we use to answer this question and previews our core findings: five rights that are practiced on an individual basis—the right to free speech, the prohibition of torture, the freedom of movement, the right to education, and the right to healthcare—are not associated with better rights practices, while three rights that are practiced by and within organizations (“organizational rights”)—the freedom of religion, the right to unionize, and the right to form political parties—are associated with higher levels of respect for those rights in practice. The chapter further provides a summary of our core theoretical explanation for these findings: to enforce constitutional rights, rights violations need to be politically costly, and formal organizations are better equipped to impose such costs than unorganized citizens.