 An advantage of contractualism is that it can capture the wide range of considerations that are relevant to moral deliberation. All the considerations that provide individuals with reasonable grounds for objecting to a proposed principle are relevant. As we saw in section 3.2, these considerations include more than the direct (and even the indirect) impact of a proposed principle on individual well-being. This plurality of considerations is nevertheless unified by a single normative domain or subject matter: unjustifiability.