  Formation of chaos in the parametric dependent system of interacting
oscillators for the both classical and quantum cases has been investigated.
Domain in which classical motion is chaotic is defined. It has been shown that
for certain values of the parameters from this domain, form of the classical
power spectrum is in a good agreement with the quantum band profile. Local
density of states is calculated. The range in which application of perturbation
theory is correct has been defined.
