An expert advisory team has been appointed by ESA with the purpose of advising the Agency on the best scientific and technological roadmap to pursue in order to address one of the most exciting goals in modern astrophysics: the characterization of terrestrial exo-planets (up to the possible detection of biomarkers). The Exo-Planet Roadmap Advisory Team (EPR-AT) will consult with the scientific community and will report back to the Agency on the time-scale of one year. A Call for White Papers from the scientific community will be issued by ESA in May 2008.