  The present paper highlights the data analysis status of the OPERA
experiment. The experiment was designed to perform the neutrino interactions
analysis on event-by-event basis, and optimized to search for $\nu_{\mu}
\rightarrow \nu_{\tau}$ oscillation in appearance mode, also allowing to
perform a $\nu_{e}$ appearance search.
  We review the data simulation and the analysis chains implemented to search
for $\nu_{\tau}$ interactions. The main kinematical parameters sensitive to the
neutrino flavor are discussed, the uncertainties of the event parameter
estimation are reviewed, and the main sources of background for the $\nu_{\mu}
\rightarrow \nu_{\tau}$ oscillation search are examined. The topologies of the
two first $\nu_{\tau}$ candidate events are presented.
  Finally, we review the status of the $\nu_{e}$ appearance search and present
the constraints set by the OPERA experiment on the mixing angle $\theta_{13}$
and on the LSND/MiniBooNE anomaly.
