Redshift quantization has three main facets: 1) the internal organizat
ion of galaxies, 2) differential effects between galaxies in physical
systems, 3) global effects linking all galaxies and cosmology. The sub
ject originated as an outgrowth of redshift correlation studies includ
ing studies of internal kinematics of galaxies. While possibly central
to understanding redshift quantization, this aspect is complex and la
rgely undeveloped. The bulk of the evidence for redshift quantization
comes from differential and global periodicity testing. More recently
redshift variability has been associated with the phenomenon. Early wo
rk in theory led to a determination of q(0) close to 0.5. A. new assoc
iation between quantization and the Cosmic Background Radiation furthe
r links redshift quantization with basic cosmology.