The Matrix organizes all moderately rigorous to rigorous police evaluation research into a three-dimensional
grid. The grid's axes reflect common dimensions of crime prevention programs, including the type of target,
whether the intervention is general or focused, and the level of proactivity employed. Each evaluation is
mapped into the Matrix according to where they fall on each of these dimensions, so that more general
patterns of effective realms, or intersections of the three dimensions, can emerge.

We have included a MATRIX KEY* that explains all parts of the Matrix, identified REALMS OF
EFFECTIVENESS* within the Matrix, and also provided USAGE IDEAS* for the Matrix. The Matrix
includes all studies up to December 2008 and will be updated twice a year.

Click here to see instructions on using the Matrix below and accessing subsets or the entire database of
the 92 studies.**

To see an animated version of the Matrix being mapped, click here.

Instructions on Using the Matrix

• To view a list of all the studies in each target "slab," please click "Individuals", "Groups", "Micro Places",
  etc.

• Click within any of the circled areas to view more information on the studies located within each circles. For
  more information on the circled areas, see the Realms of Effectiveness* page.

• The Matrix Key* explains how each study was mapped into the Matrix and what each axis means.

• Dots are color-coded according to whether a study was shown to be effective, ineffective, harmful, or had
  mixed effects. (see how we define these on our Results Coding page)

• Only moderate to rigorous evaluation studies were included in the Matrix. See our Methodological
  Rigor Page for explanation.

• Click here to download an Excel file of all the studies and how they were coded into the Matrix.**

*Requires Adobe Acrobat Reader
** Requiers Microsoft Excel Viewer

Note to user: The placement of the dots within sections of the Matrix is for visual purposes only. For example, the
exact location of a dot within the group of studies that are individual-based, reactive, and focused is not meant to
portray differences in the study's location along the y or z axis.