1. See Braga, A. et al., “The Concentration and Stability of Gun Violence at Micro Places in Boston, 1980–2008,” Journal of Quantitative Criminology 26, no. 1 (2010): 33–53.
Google Scholar | Crossref | ISI2. See Braga, A. et al., “Focused Deterrence Strategies and Crime Control: An Updated Systematic Review and Meta-analysis of the Empirical Evidence,” Criminology & Public Policy 17, no. 1 (2018): 205–250.
Google Scholar | Crossref3. Id.; Engel, R.S. , “Focused Deterrence Strategies Save Lives: Introduction and Discussion of an Updated Systematic Review and Meta-Analysis,” Criminology & Public Policy 17, no. 1 (2018): 199-203;

Google ScholarKennedy, D. et al., “Beyond deterrence” in Tilley, N., Sidebottom, A., eds., Handbook of Crime Prevention and Community Safety (London: Routledge, 2017): at 157–182.
Google Scholar | Crossref

4. Individual Gun Violence Intervention, National Network for Safe Communities, available at <https://nnscommunities.org/strategies/individual-gun-violence-intervention/> ().
Google Scholar5. Given the study's focus on challenges from the perspective of implementing stakeholders, we did not interview the individuals targeted by the study, which would be a fruitful area of future study. It is also important to credit the New Haven community's positive reception of Project Longevity. See Bass, P. , “Gang Violence Project Kicks off,” New Haven Independent, November 27, 2012.
Google Scholar6. See Braga, A., Weisburd, D., “Focused Deterrence and the Prevention of Violent Gun Injuries: Practice, Theoretical Principles, and Scientific Evidence,” Annual Review of Public Health 36, no. 1 (2015): 55–68.
Google Scholar | Crossref | Medline7. CT Against Gun Violence , Gun Facts, available at <https://cagv.org/gun-facts/> ().
Google Scholar8. See Sierra-Arévalo, M., Papachristos, A., “Applying Group Audits to Problem-Oriented Policing,” in Bichler, G., Malm, A., eds., Disrupting Criminal Networks: Network Analysis in Crime Prevention (Boulder: Lynne Rienner, 2015): 27–46;

Google ScholarSierra-Arévalo, M. et al., “Evaluating the effect of project longevity on group-involved shootings and homicides in New Haven,” Crime & Delinquency 63, no. 4 (2017): 446–467.
Google Scholar | SAGE Journals | ISI

9. Dozens of GVI strategies around the country receive support from the National Network for Safe Communities (NNSC), an entity formed to provide guidance and technical assistance to law enforcement partners structuring GVI interventions. Although the National Network for Safe Communities offers a set of detailed guidelines for ‘Call-ins,’ some local adaptation occurs. See Group Violence Intervention — An Implementation Guide, National Network for Safe Communities, available at <https://www.nationalpublicsafetypartnership.org/clearinghouse/Content/ResourceDocuments/Group%20Violence%20Intervention%20-%20An%20Implementation%20Guide.pdf> ().
Google Scholar10. See Sierra-Arévalo, M. et al., “Evaluating the Effect of Project Longevity on Group-Involved Shootings and Homicides in New Haven, Connecticut,” Crime & Delinquency 63, no. 4 (2017): 446–467.
Google Scholar | SAGE Journals | ISI11. See See Braga, A. et al., “Deterring Gang-Involved Gun Violence: Measuring the Impact of Boston's Operation Ceasefire on Street Gang Behavior,” Journal of Quantitative Criminology 30, no. 1 (2014): 113–139;

Google ScholarBraga, A., Weisburd, D., “The Effects of Focused Deterrence strategies on crime: A Systematic Review and Meta-analysis of the Empirical Evidence,” Journal of Research in Crime and Delinquency 49, no. 3 (2012): 323–358;

Google ScholarPapachristos, A. et al., “Attention Felons: Evaluating Project Safe Neighborhoods in Chicago,” Journal of Empirical Legal Studies 4, no. 2 (2007): 223–272.
Google Scholar | SAGE Journals | ISI

12. See Engel, R.S., Tillyer, M.S., Corsaro, N., “Reducing Gang Violence Using Focused Deterrence: Evaluating the Cincinnati Initiative to Reduce Violence (CIRV),” Justice Quarterly 30 (2013): 403–439.
Google Scholar | Crossref | ISI13. Id.
Google Scholar14. See Corsaro, N., Engel, R.S., “Most Challenging of Contexts: Assessing the Impact of Focused Deterrence on Serious Violence in New Orleans,” Criminology & Public Policy 14, no. 3 (2015): 471–505.
Google Scholar | Crossref15. See McGarrell, E.F. et al., “Reducing Homicide Through a ‘Lever-Pulling’ Strategy,” Justice Quarterly 23 (2006): 214–231.
Google Scholar | Crossref | ISI16. See Braga, A., Weisburd, D., “The Effects of Focused Deterrence Strategies on Crime: A Systematic Review and Meta-analysis of the Empirical Evidence,” Journal of Research in Crime and Delinquency 49, no. 3 (2012): 323–358.
Google Scholar | SAGE Journals | ISI17. See Braga, A. et al., “Focused Deterrence Strategies and Crime Control: An Updated Systematic Review and Meta-analysis of the Empirical Evidence,” Criminology & Public Policy 17, no. 1 (2018): 205–250
Google Scholar | Crossref18. For more details on this issue and recommended improvements, please see the Online Appendix.
Google Scholar19. BVRI Implementation Update, National Network for Safe Communities, available at <https://jjie.org/wp-content/uploads/2019/05/NNSC_BVRI-Implementation-Update-1.pdf> ().
Google Scholar20. Davies, T. et al., Group Violence Intervention London: An Evaluation of the Shield Pilot,” Mayor of London Office for Policing and Crime, available at <https://www.london.gov.uk/sites/default/files/gvi_london_evaluation270117.pdf> ().
Google Scholar21. See Fox, A. et al., Measuring the Impact of Kansas City's No Violence Alliance (evaluating a focused deterrence strategy to combat gun violence) (2015).
Google Scholar22. Our interview schedule is available in the Online Appendix.
Google Scholar23. The Online Appendix includes a description of participant roles (Table 1).
Google Scholar24. See Deterding, N., Waters, M., “Flexible Coding of In-depth Interviews: A Twenty-first century Approach,” Sociological Research & Methods (2018): 1–32.
Google Scholar25. Two of the 24 interviewees said they were unable to comment because they had not been involved with Longevity since its implementation.
Google Scholar26. See Online Appendix for additional themes (Figure 1).
Google Scholar27. Himmelman, A. , Collaboration for a Change: Definitions, Decision-Making Models, Roles, and Collaboration Process Guide, Himmelman Consulting, available at <http://tennessee.edu/wp-content/uploads/2019/07/Himmelman-Collaboration-for-a-Change.pdf> ().
Google Scholar28. See Fisher, P. Foster et al., “Facilitating Interorganizational Collaboration: The Contributions of Interorganizational Alliances,” American Journal of Community Psychology 29, no. 6 (2001): 875–905.
Google Scholar | Crossref | Medline29. To keep interview participants anonymous, we have replaced names for numeric identifiers and omitted self-identifying information from quotes presented along the text.
Google Scholar30. Sullian, H., Skelcher, C., Working Across Boundaries: Collaboration in Public Service (London: Palgrave, 2002): at 100.
Google Scholar | Crossref31. See section 2.1 of this article (implementation and progress reports).
Google Scholar32. See Sedgewick, D., Hawdon, J., “Interagency Cooperation in the Era of Homeland Policing: Are Agencies Answering the Call?” American Journal of Criminal Justice 44 (2019): 167-190.
Google Scholar | Crossref33. Sullian, H., Skelcher, C., Working Across Boundaries: Collaboration in Public Service (London: Palgrave, 2002): at 100.
Google Scholar | Crossref34. See Alshenqeeti, H. , “Interviewing as a Data Collection Method: A Critical Review,” English Linguistics Research 3, no. 1 (2014): 39-45;

Google ScholarBjork, R.A. , “Retrieval as a Memory Modifier: An Intepretation of Negative Recency and Related Phenomena,” Information Processing and Cognition: The Loyola Symposium (1975): 124–144.
Google Scholar | Crossref