This basic primer was written by Loren Siegel based on her work managing the American Civil Liberties Union's public opinion research program during her tenure as Public Education Director (1991-2001). It describes the various tools used in public opinion research and provides guidance on how advocates can integrate research findings into their work. The guide features a series of case studies illustrating how the ACLU used its research to develop strong messages, identify potential supporters, and gauge the intensity of support for or opposition to its advocacy goals.