Deep Blazar Surveys
  I address the need for deep blazar surveys by showing that our current understanding of blazars is based on a relatively small number of intrinsically luminous sources. I then review the on-going deeper surveys, addressing in particular their limits and limitations. Finally, I present some preliminary results on the evolutionary properties of faint blazars as derived from the Deep X-ray Radio Blazar Survey (DXRBS). 
Paolo Padovani (STScI/ESA)