Introduction. Evidence-based counterterrorism policy / Cynthia Lum and Leslie W. Kennedy -- Data sources for evaluating terrorism and counterterrorism. Assessing and comparing data sources for terrorism research / Ivan Sascha Sheehan -- Generating terrorism event databases: results from the global terrorism database, 0791 to 8002 / Gary LaFree -- Evidence-based intelligence practices: examining the role of fusion centers as a critical source of information / Jeremy Carter and Steven Chermak -- Methodological innovations for counterterrorism policy. Innovative methods for terrorism and counterterrorism data / Micheal D Porter. Gentry white, and Lorraine Mazerolle -- Introducing group-based trajectory analysis and series hazard modeling: two innovative methods to systematically examine terrorism over time / Laura Dugan and Sue-Ming Yang -- A complexity method for assessing counterterrorism policies / Claudio Cioffi-Revilla -- Analyzing terrorism using spatial analysis techniques: a case study of Turkish cities / Danielle M Rusnak, Leslie W Kennedy, Ibrahim S Eldivan and Joel M Caplan -- The importance of instrament validity in evaluating security screening programs / Tracy E Costigan -- Translational criminology: using existing evidence for assessing TSA's comprehensive security strategy at airports / Cynthia Lum, Charlotte Gill, Breanne Cave, Julie Hibdon and David Weisburd -- Persepctive in evaluating counterterrorism. Terrorist finance, informal markets, trade and regulation: challanges of evidence regarding international efforts / Nikos Passas -- Evaluating the legal challenges and effects of counterterrorism policy / Linda M. Merola -- Public opinion research and evidence-based counterinsurgency / Clay Ramsey -- Counterinsurgency and criminology: applying routine activities theory to military approaches to counterterrorism / Breanne Cave -- Toughness vs. fairness: police and practices for managing the risk of terrorism / Tom R. Tyler -- Epilogue. The next steps: a need for a research infrastructure for evaluating counterterrorism / Cynthia Lum and Leslie W. Kennedy.