Crime prevention policy and practice is on the whole far from objective. Instead of being based on scientific evidence the crime policy agenda is seemingly driven by political ideology, anecdotal evidence and programme trends. This title seeks to change this by comprehensively and rigorously assessing the existing scientific knowledge on the effectiveness of crime prevention programmes internationally. Reviewing more than 600 scientific evaluations of programmes intended to prevent crime in settings such as families, schools, labour markets and communities, this book grades programmes on their scientific validity using the "scientific methods scale". This collection, which brings together contributions from leading researchers in the field of crime prevention, provides policymakers, researchers and community leaders with an understandable source of information about what works, what does not work and what is promising in preventing crime.