  We review work on the evolution of planetary nebulae and proto-planetaries
via magneto-rotational mechanisms showing that a dynamo generated magnetic
field can produce the energy and momentum needed to drive pPN and PNe outflows.
Angular momentum considerations lead to the conclusion that single stars may
not be capable of supporting strong fields for long times. Thus we take the
working hypothesis that most PN may form via binary stars. We propose that the
grand challenge for PN studies is fully understanding the diverse physical
processes at work in binary late stage evolution including the development of
disks, fields and outflows.
