relatively new and rather unexplored class of variable stars is represented
by the PMS $\delta$ Scuti stars. The number of
these pulsators has rapidly increased during the last few years, also
thanks to our theoretical and observational efforts.
I will briefly review the status of the art for these objects, and present
recent results obtained by our group.
The comparison between theory and observations is used to derive information
on the distance and intrinsic stellar parameters.
Future developements are briefly discussed.