  We have developed 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. 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 nucleon and electron interstellar spectra, and computation of the
Galactic diffuse gamma-ray emission. We show that combining information from
classical cosmic-ray studies with gamma-ray and other data leads to tighter
constraints on cosmic-ray origin and propagation.
