 Rawls’ “moral powers” condition has posed further problems. Harry Brighouse (2001) observes that modifying the cooperation requirement still excludes those whose cognitive impairments preclude their possession of the two moral powers. Sophia Wong (2009, 2007) argues that those powers can be acquired by people with severe intellectual impairments, with adequate social support. Leslie Francis (2009) and Anita Silvers (Silvers and Francis 2009) contend that many individuals with severe cognitive impairments can collaborate with others to construct individualized, authentic conceptions of the good. Silvers and Francis (2005) and Christie Hartley (2009a) also maintain that people with severe intellectual impairments can be represented adequately in a contracting process that consists in trust-building more than hard bargaining, even if they cannot participate in it personally.