This is to invite you to participate in an online debate on the future of HIV/AIDS Communication, and particularly the challenges of evaluation in this field. The debate is designed particularly to help inform the agenda and discussions of this forthcoming meeting of the Communication for Development Roundtable - a meeting of senior representatives from United Nations, donors and other international organisations working on HIV/AIDS Communication issues. The debate is open both to all participants in the meeting and to any others who wish to engage in it.