Center for Problem-Oriented Policing  How is the concentration
of risk among facilities calculated?  Once a satisfactory
measure of the problematic events for a defined group of
facilities has been obtained, the following six-step procedure
can be used to determine whether the 80/20 rule applies.    1.
List the facilities alongside a count of the number of relevant
events (e.g. thefts, assaults, calls for service) at each
facility. Remember, it is important to verify that each facility
on the list is of the type being investigated and that every
crime attributed to each facility did in fact occur at that
facility. (See Box 2 for a discussion of creating such a list
and verifying its content.)   2. Rank the facilities according
to the number of events associated with each, from highest to
lowest. (Table 1 is a list of hypothetical pubs along with the
associated number of reported assaults.) Determine whether there
is something that differentiates the facilities at the top of
the list from those in the middle o