Probing Nucleon Spin Structure

One of the important questions in high energy physics is the relation of quark and gluon spin to that of the nucleons which they comprise. Polarization experiments provide a mechanism to probe the spin properties of elementary particles and provide crucial tests of Quantum Chromodynamics (QCD). The theoretical and experimental status of this fundamental question will be reviewed in this paper.Comment: 65 pages, 3 Postscript figures, LaTeX. To be published in "Progress in Particle and Nuclear Physics