The MatrixLiving evidence prototype
AI backend cebcp.org ↗

Center for Evidence-Based Crime Policy · George Mason University

What works in policing, drawn from the data instead of a picture.

Every tile below is computed live from the 275 studies on cebcp.org. Hover a cell to see what is in it, switch the lens to see how rigor changes the picture, then ask the Matrix a question in plain English.

The Matrix

Color by
Rigor lens
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Low High effectiveness fewer than 4 studies Dashed: no studies yet

Realms of effectiveness

Cells with at least 5 studies, ranked by share of effective or mixed outcomes under the current lens.

    Where the evidence is thin

    Empty and sparse cells are research opportunities, not verdicts.

      0studies

      Evidence-Based Policing Playbook · revised June 2026 · linked to the Matrix

      Every play, with the evidence behind it

      The 17 plays from the CEBCP Playbook, each mapped to its Matrix cell and to the studies that test it. Plays with thin or out-of-scope evidence say so. When a new study enters the Matrix, the plays in its cell are flagged automatically.

      Strong evidenceModerateThinOutside Matrix scope

      Crime prevention plays

      Trust and confidence plays

      The Matrix includes only studies with crime or disorder outcomes, so legitimacy and trust evidence is out of its scope by design. These cards show the nearest crime-outcome evidence and say so.

      Draft a new play from the evidence AI draft

      Describe a recurring condition. The assistant retrieves effective and mixed-result Matrix studies, drafts a play in Playbook format, and cites each step. The MDP team edits before anything is published.

      Matrix Workbench

      The editorial side of a living Matrix. Candidate studies arrive continuously; the assistant pre-screens them against the inclusion criteria, proposes coding with its reasons, and drafts the summary in house style. Two human coders still decide.

      SurveillanceScheduled searches across the 11 databases, Scholar alerts, CrimeSolutions
      AI pre-screenInclusion criteria check with quoted evidence
      AI coding draftX / Y / Z, rigor, outcome, confidence
      Two-coder reviewAccept, edit, or reject; disagreements logged
      PublishGrid recolors, changelog and digest drafted

      Screen a candidate study

      Paste an abstract or a methods and results section. A sample is loaded so you can run it immediately.

      Screening result

      Results appear here: criteria checklist, recommendation, suggested Matrix coding, a draft summary, and anything a human must verify.