This chapter lays out the study’s research design. The design aims to enhance cycles of silence theory’s generalizability at two levels. At a macro level, the goal is to increase the potential that, contingent on local factors, the theory applies to as many of the communities facing criminal group violence as possible. It does so by drawing on logic derived from human social psychological dynamics, leveraging a wide range of existing datasets including a global survey of 109,000 citizens, and studying communities both the Global North (Baltimore, Maryland) and Global South (Lagos, Nigeria). At a micro level, the design combines cross-national data with original surveys as well as interviews and first- hand observations in Baltimore and Lagos. This multimethod approach improves the likelihood that the findings from the surveys and interviews in Baltimore and Lagos accurately reflect cooperation dynamics in the cities. Finally, the chapter provides definitions for key terms related to the study’s main actors – criminal groups, police, and citizens – and the main outcome of citizen cooperation with the police.