The Millennium Ecosystem Assessment (MEA), an international process designed to strengthen capacity to manage ecosystems sustainably for human well-being, is currently inviting scientific societies, academies, ministries, and research organizations to become Affiliated Scientific Organizations and Academies to the MA (ASOA). ASOA members, for example, will be encouraged to submit nominations of individuals to serve as lead authors and expert reviewers in the MA process. ASOA members, in turn, will receive a limited number of copies of final reports and be asked to participate in various MA activities. Organizations interested in become ASOA members should submit a one-page description of their mission, membership, and activities. For additional information, contact Nicolá J. Lucas at the World Resources Institute in Washington (email: firstname.lastname@example.org).