As numerous review articles attest, approaches to the study of military interventions in African politics have varied widely in their methodology and foci of concern.1 Over the last decade, a good deal of runing has been made by quantitatively-inclined political scientists, such as Alan Wells, Roberta McKown, Ruth Collier, and especially Robert Jackman, whose particular path towards the understanding of military interventions has Iain through aggregate-data analysis of structural fratures of African states.2 This line of approach has recently been brought to a high level of sophistication in two major articles: Thomas H. Johnson, Robert O. Slater, and Pat McGowan, ‘Explaining African Military Coups d'Etat, 1960–1982’, in The American Political Science Review (Washington, D.C.), 78, 3, September 1984, pp. 622–40, and Pat McGowan and Thomas H. Johnson, ‘African Military Coups d'Etat and Underdevelopment: a quantitative historical analysis’, in this Journal, 22, 4, December 1984, pp. 633–66. The A.P.S.R. article is described by the authors as ‘only the latest and not the last word on these matters’ (p. 637), and it has already fulfilled this implicit prophecy by generating debate among those who have adopted a similar methodology.3