 How are we to go about choosing between the different distributive principles on offer, and respond to criticisms of the principles? Unfortunately, few philosophers explicitly discuss the methodology they are using. The most notable exception is John Rawls (1971, 1974) who explicitly brought the method of wide reflective equilibrium to political philosophy. This method has been brilliantly discussed by Norman Daniels over the years and the reader is strongly encouraged to refer to his entry (see  reflective equilibrium)  to understand how to evaluate, revise and choose between normative principles. While there is no point in reiterating the method here there are some supplementary issues worth noting.