The nominalization strategy devised by the mathematical fictionalist depends on two interrelated moves. The first is to change the aim of mathematics, which is not taken to be truth, but something different. On this view, the proper norm of mathematics, which will guide the nominalization program, is conservativeness. A mathematical theory is conservative if it is consistent with every internally consistent theory about the physical world, where such theories do not involve any reference to, nor quantification over, mathematical objects, such as sets, functions, numbers etc. (Field 1989, p. 58). Conservativeness is stronger than consistency (since if a theory is conservative, it is consistent, but not vice versa). However, conservativeness is not weaker than truth (Field 1980, pp. 16–19; Field 1989, p. 59). So, Field is not countenancing a weaker aim of mathematics, but only a different one.