  We present the results of a photometric multisite campaign on the $\delta$
Scuti Pre-Main-Sequence star IP Per. Nine telescopes have been involved in the
observations, with a total of about 190 hours of observations over 38 nights.
Present data confirms the multiperiodic nature of this star and leads to the
identification of at least nine pulsational frequencies. Comparison with the
predictions of linear non-adiabatic radial pulsation models allowed us to
identify only five of the nine observed frequencies, and to constrain the
position of IP Per in the HR diagram. The latter is in good agreement with the
empirical determination of the stellar parameters obtained by Miroshnichenko et
al. (2001). An initial interpretation of the observed frequencies using the
Aarhus non-radial pulsation code suggests that three frequencies could be
associated with non-radial ($l$=2) modes. Finally, we present new evolutionary
and pulsation models at lower metallicity (Z=0.008) to take into account the
possibility that IP Per is metal deficient, as indicated by Miroshnichenko et
al. (2001).
