  The aim of these lectures is to investigate the transfer of information
occurring in course of quantum interactions. In particular, I shall explore
circumstances in which such an information transfer with the quantum
environment of the considered quantum system leads to the destruction of the
phase coherence between the states of the privileged basis in the system
Hilbert space. This basis shall be called the pointer basis. I shall argue that
states of this pointer basis correspond to the ``classical'' states of the
observables of the quantum system in question.
