This article describes some results of a successful attempt to assess and refine a causal model of the general conditions of several forms of civil strife, using cross-sectional analyses of data collected for 114 polities. The theoretical argument, which is discussed in detail elsewhere, stipulates a set of variables said to determine the likelihood and magnitude of civil strife. Considerable effort was given here to devising indices that represent the theoretical variables more closely than the readily-available aggregate indices often used in quantitative cross-national research. One consequence is an unusually high degree of statistical explanation: measures of five independent variables jointly account for two-thirds of the variance among nations in magnitude of civil strife (R = .80, R2= .64).