Background theories allegedly work as measures for scrutinising our subjective judgements, but, in the final analysis, the question whether these background theories themselves are convincing or justified, and whether we are prone to reconsider our judgements, depends on whether the background theories correspond to our subjective judgements since Rawls does not want to be committed to "philosophical' assumptions. It seems that he can only break the circle if he grants background theories at least a qualified subject-independent plausibility.