  We have studied the emergence of classical states in the perturbative
interaction model. The states which interact with many other degrees of
freedom, such as the center of mass of a macro-object, play important role.
Although the random phase mechanism is effective as same as Zurek's strong
correlation model, there are enormous states, each of which independently
developes due to the orthogonality of the environmental states. In these
privileged states, the subsystem picture with the separability is stable.
