International development is on the verge of change. As the current development framework, the Millennium Development Goals, enters its final year in 2015, governments and key actors for civil society are negotiating a new vision for development. If development for all is the process of enlarging people's opportunities in order to create a sustainable future for all, then persons with disabilities as part of the world's community cannot be overlooked.This first publication in CBM's Series on Disability-Inclusive Development covers key facts and figures on the situation of women, men, girls and boys with disabilities living in low-income countries and presents the reasons why development and humanitarian actions must be disability-inclusive. In its main part, this publication presents principles of disability-inclusive development which explain how disability-inclusive development can be achieved. These principles are illustrated with examples of how CBM has endeavoured to implement disability-inclusive development, and what has been learned along the way. Key topics covered:-Key concepts in disability-inclusive development and reflections on CBM's own journey towards disability-inclusive development.-Key reasons why the inclusion of women, men, girls and boys with disabilities is important for effective development and humanitarian outcomes. -Reasons why the human rights of women, men, girls and boys with disabilities are closely associated with development both at home and in international cooperation.-Key issues which cause barriers to disability-inclusive development, and a set of principles to overcome these barriers.-Key messages for the future of disability-inclusive development.