  We are constructing a model which aims to reproduce observational data of
many kinds related to cosmic-ray origin and propagation: direct measurements of
nuclei, antiprotons, electrons and positrons, gamma-rays, and synchrotron
radiation. These data provide many independent constraints on any model.
Propagation of primary and secondary nucleons, primary and secondary electrons
and positrons are calculated self-consistently. Fragmentation and energy losses
are computed using realistic distributions for the interstellar gas and
radiation fields, and diffusive reacceleration is also incorporated. The models
are adjusted to agree with the observed cosmic-ray B/C and 10Be/9Be ratios.
  Our main results include evaluation of diffusion/convection and
reacceleration models, estimates of the halo size, calculations of the
interstellar positron and antiproton spectra, evaluation of alternative
hypotheses of hard nucleon and hard electron interstellar spectra, and
computation of the Galactic diffuse gamma-ray emission.
