  The space quantization induced by a Stern-Gerlach experiment is normally
explained by invoking the ``collapse of the wave function.'' This is a rather
mysterious idea; it would be better to explain the Stern-Gerlach results
without using it. We re-analyze the Stern-Gerlach experiment using path
integrals. We find if we model explicitly the finite width of the beam,
coherent interference within the beam itself provides the space quantization --
without need to invoke the collapse. If we insist on employing only wave
functions with the space and spin parts kept forcibly disentangled, we recreate
the need to invoke the collapse. The collapse-free approach makes more specific
predictions about the shape and position of the scattered beams; if the
interaction region has finite length, these may be testable. Pending
experimental disambiguation, the chief arguments in favor of the collapse-free
approach are that it is simpler and less mysterious, has no adjustable
parameters, and requires the invocation of no new forces.
