  Some responses to the specification problem are unsuccessful. One could say that we have grounds for saying that (1) is false and (2) is true because the latter coheres with propositions which correspond to the facts. Coherentists cannot, however, adopt this response without contradicting their position. Sometimes coherence theorists maintain that the specified system is the most comprehensive system, but this is not the basis of a successful response to the specification problem.  Coherentists can only, unless they are to compromise their position, define comprehensiveness in terms of the size of a system. Coherentists cannot, for example, talk about the most comprehensive system composed of propositions which correspond to reality. There is no reason, however, why two or more systems cannot be equally large. Other criteria of the specified system, to which coherentists frequently appeal, are similarly unable to solve the specification problem. These criteria include simplicity, empirical adequacy and others. Again, there seems to be no reason why two or more systems cannot equally meet these criteria.