  We propose that cosmic rays originate mainly in three sites, a) normal
supernova explosions into the interstellar medium, b) supernova explosions into
stellar winds, and c) hot spots of powerful radio galaxies. The proposal
depends on an assumption about the scaling of the turbulent diffusive transport
in cosmic ray mediated shock regions; the proposal also uses a specific model
for the interstellar transport of cosmic rays. The model has been investigated
in some detail and compared to i) the radio data of OB stars, Wolf Rayet stars,
radio supernovae, radio supernova remnants, Gamma-ray line and continuum
emission from starforming regions, and the cosmic ray electron spectrum, ii)
the Akeno air shower data over the particle energy range from 10 TeV to EeV,
and iii) the Akeno and Fly's Eye air shower data from 0.1 EeV to above 100 EeV.
Here we specifically discuss in some detail the assumptions inherent in the
model proposed, concerning the transport of energetic particles, first in the
acceleration region, and second in the Galaxy.
