  It is generally accepted that the Copenhagen interpretation is inapplicable
to quantum cosmology, by contrast with the many worlds interpretation. I shall
demonstrate that the two basic principles of the Copenhagen interpretation, the
principle of wholeness and the principle of complementarity, do make sense in
quantum gravity, since we can judge about quantum gravitational processes in
the Very Early Universe by their vestiges in our macroscopic Universe. I shall
present the extended phase space approach to quantum gravity and show that it
can be interpreted in the spirit of the Everett's `relative states'
formulation, while there is no contradiction between the `relative states'
formulation and the mentioned basic principles of the Copenhagen
interpretation.
