  It is shown that Schrodinger's equation and Born's rule are sufficient to
ensure that the states of macroscopic collective coordinate subsystems are
microscopically localized in phase space and that the localized state follows
the classical trajectory with random quantum noise that is indistinguishable
from the pseudo-random noise of classical Brownian motion. This happens because
in realistic systems the localization rate determined by the coupling to the
environment is greater than the Lyapunov exponent that governs chaotic
spreading in phase space. For realistic systems, the trajectories of the
collective coordinate subsystem are at the same time an "unravelling" and a set
of "consistent/decoherent histories". Different subsystems have their own
stochastic dynamics that generally knit together to form a global dynamics,
although in certain contrived thought experiments, most notably Wigner's
friend, in the contrary, there is observer complementarity.
