This volume aims to motivate the inclusion of broader and deeper insights from the behavioral sciences – especially behavioral economics, cognitive psychology, and social psychology – to the repertoire of public managers by introducing new methodologies for diagnosing the root causes behind public problems and for designing effective policies to address them. The new diagnosis tool – the MSI framework (an acronym for Motivation, Self-control, and Inattention problems) –, will help identify new mechanisms underlying social problems or reinterpret known problems based on behavioral insights. The new methodology for policy design – the PRIx framework (an acronym for Pricing policies, Regulatory policies, and Information policies) –, will enrich existing policy tools with such behavioral insights. will be a useful and practical guide to public managers and students of graduate and advanced undergraduate courses in public management interested in learning how to apply innovative tools and methodologies inspired by the behavioral sciences into public policy design in a simple and practical way, even when dealing with complex social problems.