 Among the critiques of Lewis-style conventionalist theories are: that many social phenomena do not appear to be solutions to coordination problems; that they are excessively mentalistic, involving a complex structure of beliefs, knowledge, expectations, and preferences of the population; and that they regard conventions as regularities in behavior having certain characteristics, so the analysis rules out as conventions anything that is not exemplified in behavioral regularity (see Burge 1975, Millikan 2005). The critiques, however, are complicated by the malleability of the notion of convention: it is not clear whether these should be regarded as difficulties for conventionalism or for Lewis’ analysis.