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This chapter examines the nature and role of theory in criminal justice evaluation. A distinction between theories of and theories for evaluation is offered to clarify what is meant by ‘theory’ in the context of contemporary evaluation practice. Theories of evaluation provide a set of prescriptions and principles that can be used to guide the design, conduct and use of evaluation. Theories for evaluation include programme theory and the application of social science theory to understand how and why criminal justice interventions work to generate desired outcomes. The fundamental features of these three types of theory are discussed in detail, with a particular focus on demonstrating their combined value and utility for informing and improving the practice of criminal justice evaluation.

Across the Americas, public discussions of crime and penal practices have become increasingly punitive even as political struggles have resulted in a broad shift toward Constitutional democracy. In this chapter, we suggest that the spread of tough anti-crime talk and practice is, paradoxically, a response to efforts to expand and deepen democracy. Punitive crime talk is useful to political actors seeking to limit formal and social citizenship rights for several reasons. First, it ostensibly targets problematic behavior rather than particular social groups, and thus appears to be consistent with democratic norms. At the same time, crime talk often acquires coded meanings that enable those who mobilize it to tap into inter-group hostility, anxieties, and fear. In addition, the emphasis on the threat of crime and disorder offers those seeking to limit democratic expansion a way to legitimate truncated visions of the rights and entitlements of citizenship. Tough anti-crime rhetoric often resonates with those who have experienced or fear the loss of symbolic and/or material benefits as a result of democratic reform. In short, the broad shift toward hyper-penality is, at least in part, a consequence of struggles over political democracy, citizenship and governance across the Americas.