Since the end of the cold war, foreign policy makers appear to be devo
ting increasing amounts of energy to containing intrastate conflicts.
They are doing so, moreover, with little guidance from the social scie
nce community. This article uses data on all third-party interventions
into intrastate conflicts since 1944 to assess historical patterns of
intervention strategies and their relative success rates. Building on
this, it uses a logit analysis to develop prescriptive outlines for f
uture intervention attempts. The results demonstrate that it is the ch
aracteristics cf thr intervention strategy rather than the characteris
tics of the conflict that largely determine the success of the interve
ntion.