AIDS has radically changed the contexts in which development and humanitarian organisations operate, and now they need to adapt their policies and practice accordingly. Sue Holden explains the concept of mainstreaming HIV/AIDS in simple language, with practical guidelines for applying the approach in a wide range of sectors.Sue Holdens previous book, AIDS on the Agenda: Adapting Development and Humanitarian Programmes to Meet the Challenge of HIV/AIDS, made the case for mainstreaming, using both theoretical discussion and experiences from the field. She has now adapted that work to produce this shorter and simpler book, to make the idea and practice of mainstreaming more accessible to those who actually do development and humanitarian work, as well as those who manage and fund it.