This is a reexamination of the statistical analysis undertaken by Lewis F. Richardson, the major initiator of the "systematic approach" to the causes of war. The author elaborates on Richardson's quantitative data, bringing it up to date and making it more palatable to the nonscientific reader, although it still remains quite arcane. Wilkinson also draws his own conclusions, based on Richardson's early findings, about the necessary direction for a "strategy of peace."