The current cascade models are advancing from a phenomenological level towards straightforward detailed calculations of the kinetics. The recent progress in quantum mechanical calculations of the scattering of exotic atoms in excited states makes it possible to get rid of tuning parameters and ad hoc assumptions in future calculations. The ultimate goal of ab initio cascade calculations does not seem to be unrealistic any more.
A detailed knowledge of atomic cascade is essential for
precision X-ray spectroscopy of the 
atom where the
Doppler-broadening corrections must be taken into account in order to
measure the nuclear width of the 
state. The new generation of
precise experiments with the 
and atoms [49]
will make it possible to study the kinetics of the atomic cascade in
great detail and to perform critical tests of the theoretical methods used
in the calculations of various reactions with excited exotic atoms.
The results of theses studies will also be very useful for other
systems like 
and 
.