 The task of analyzing conventional dispositions poses no additional challenge to Manley &amp; Wasserman’s approach or Vetter’s approach, additional to those challenges posed by the task of analyzing canonical dispositions. They handle the problems of finks, maskers, mimickers, etc., not by ruling them out from the stimulus condition but by exploiting the ‘suitable proportion’ requirement. They can thereby stick to the simple definition of fragility as the disposition to break when struck (Manley &amp; Wasserman) or as the disposition to break (Vetter). From their respective analysis of canonical dispositions, then, they can readily derive an analysis of conventional dispositions like fragility that does away with ceteris paribus clauses.