  We discuss the emergence of classical trajectories in Bohmian Mechanics (BM),
when a macroscopic object interacts with an external environment. We show that
in such a case the conditional wave function of the system follows a dynamics
which, under reasonable assumptions, corresponds to that of the
Ghirardi-Rimini-Weber (GRW) collapse model. As a consequence, Bohmian
trajectories evolve classically. Our analysis also shows how the GRW
(istantaneous) collapse process can be derived by an underlying continuous
interaction of a quantum system with an external agent, thus throwing a light
on how collapses can emerge from a deeper level theory.
