  OPERA(Oscillation Project with Emulsion-tRacking Apparatus) is a new detector
concept, iron(lead)-emulsion for a long-baseline neutrino oscillation
experiment. This experiment would perform an appearance search for nu_mu-nu_tau
oscillation in the parameter region indicated by the atmospheric neutrino
anomaly. OPERA can run at the Gran Sasso Laboratory in the proposed NGS
(Neutrino to Gran Sasso) Beam from CERN.
