This document discusses including marginalized people, including those with disabilities, in development work. It defines disability as long-term physical, mental, intellectual or sensory impairments that interact with barriers in society to limit full participation. Barriers include lack of physical access, communication access, accessible equipment and information, education, work, and transport. It cites international standards and legislation on disability rights and national laws like the UK's Disability Discrimination Act. It advocates using the UN Convention on the Rights of Persons with Disabilities to guide inclusive development policies that recognize disabilities as a cross-cutting issue and ensure disability is included in analyses of poverty.