“…A valid test of necessity requires, among other things, evidence of failure when one or more of the conditions was absent, as occurred in almost half of Lebow's thirteen cases-Bosnia 1908-9, Rhineland 1936, Munich 1938-9, Morocco 1905-6, and Berlin 1948 In sum, only a fraction of "relevant" evidence has been compiled to establish whether communication, commitment, capability, and resolve are all necessary conditions for deterrence success. Although this particular hypothesis represents the version of deterrence that is most often cited, tested, and rejected by critics of the theory (Lebow, 1981;Jervis, Lebow, and Stein, 1985;Lebow and Stein, 1989a, 1989b, 1990, it is almost always tested with a methodology and body of evidence appropriate for establishing joint sufficiency, as noted by Achen and Snidal (1989), Most and Starr (1989), Dion (1996), Braumoeller and Goertz (1997), Harvey (1997aHarvey ( , 1997b, and others. By implication, much of the case-study evidence compiled by critics is not entirely appropriate for identifying (let alone testing for) necessary conditions of deterrence success or failure, is obviously inappropriate as a basis for rejecting the most commonly criticized version of the theory, and represents only a portion of the data required for a balanced evaluation of deterrence, in terms of both theory and strategy.…”