Community advisory boards (CABs) serve as a voice for the community and local study participants. CABs provide input into study design and local study procedures. CABs work to ensure that research strategies acknowledge and respect the values and cultural/ethnic differences among participants. Members of a CAB vary according to locale and situation. Membership may include community members who share characteristics of study participants (or study participants themselves), representatives of local agencies working with HIV-related services or programs, religious or community leaders, and professionals with relevant research and/or scientific expertise.