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This review talk focuses on physical processes
associated with magnetic fields. The emphasis is
on theory but connections are made with current and
possible future observational tests of various
scenarios. Some key questions I address are as follows.
Are molecular clouds subcritical, transcritical, or
supercritical on large scales? How does it matter?
Does turbulence dominate magnetic effects?
Is the core mass function related to the magnetic field?
How coupled is the magnetic field to the overwhelmingly
neutral gas at various densities?
How is ambipolar diffusion enhanced or revitalized
by turbulence and protostellar formation, respectively?
How do disks form, avoiding a catastrophic loss
of angular momentum by magnetic braking?
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