 Section 5 deals with the most influential early accounts of cp-laws. They take cp-laws to be incomplete laws that can be completed. Whereas Fodor (1987) and others (see Section 5.1) focus on special science cp-laws that can be completed by adding factors to the antecedent of the law that are dealt with in more fundamental sciences, Pietroski and Rey (1995) take cp-laws to contain (implicit) promises: that is, when asserting a cp-law, one promises to be able to cite factors that complete the law on a case by case basis if the consequent of the cp-law does not obtain (although the antecedent does). In section 5.2, we present several objections against such completer accounts.