More than 60 communal minorities were victimized as a result of intern
al wars and stare failures between 1980 and 1996. Two theoretical mode
ls provide the basis for systematic early warning of future victimizat
ion of communal and political groups. The potential for communal rebel
lion is said to be a joint function of group incentives, group capacit
y, and opportunities for collective action. Indicators of these concep
ts from the Minorities at Risk project are used to identify 73 groups
at high risk of communal rebellion in the late 1990s. Genocide and pol
iticide are attributed to background conditions (e.g. political upheav
al), intervening conditions (e.g. elite fragmentation), and a short-te
rm increase in theoretically pre-specified accelerators. Monitoring of
accelerators and de-accelerators in potential crisis situations provi
des a link between risk assessments based on structural models and ear
ly warnings of use to national and international policy-makers. The ap
proach is illustrated by an analysis of accelerators prior to the occu
rrence of the 1994 genocide in Rwanda.