  Current theories of galaxy formation have tended to focus on hierarchical
structure formation, which is the most likely scenario for cosmological models
with lots of power at small scales (e.g. standard cold dark matter). Models
with little small scale power lead to scenarios closer to spherical collapse.
Recently favored power spectra (e.g. CDM+Lambda) lie somewhere in between
suggesting that both types of processes are important and may vary over time
due to gaseous reheating. From this viewpoint this paper explores a very simple
inside out scenario for galaxy formation. This scenario is a natural result of
synthesizing earlier work on DM halos, spherical collapse, and gas
redistribution via angular momentum. Although, this model is highly simplified
and is not designed to accurately describe the detailed formation of any
individual galaxy, it does (by design) predict the overall features of
galaxies. In addition, old bulges and young disks are an almost unavoidable
result of these very simple models. This scenario may provide a useful
framework for both observers and theoreticians to think about galaxy formation.
