Preface. I: General Introduction. Macroscopic Quantum Effects in Magnetic Systems: An Overview; A.J. Leggett. II: Particles (Theory). Theory of Mesoscopic Quantum Tunneling in Magnetism: A WKB Approach; J.L. van Hemmen, A. Sutoe. Quantum Spin-Tunneling: A Path Integral Approach; R. Schilling. Quantum Tunneling in Small Particles; E.M. Chudnovsky. Macroscopic Quantum Tunneling in Ferromagnets and Antiferromagnets; H. Simanjuntak. Monte-Carlo Simulations on Reversal Magnetization of Small Clusters; P.A. Serena, N. Garcia. III: QTM in Magnetic Relaxation (Experiment). Quantum Tunneling of Magnetization; J. Tejada, X. Zhang. Relaxation and Mesoscopic Quantum Tunneling of Magnetization in Amorphous Rare-Earth Alloys; J.I. Arnaudas, et. al. Linear Response and Thermal Equilibrium Noise of Magnetic Materials at Low Temperature: Logarithmic Relaxation, VF Noise, Activation and Tunnelling; S. Vitale, et al. AC Susceptibility Relaxation Studies on a Manganese Organic Cluster Compound: MN12Ac; M.A. Novak, R. Sessoli. Evidence for Quantum Tunnelling of the Magnetization in Mn12Ac; C. Paulsen, J.-G. Park. Acoustic and Magnetic Properties of Rare-Earth-Ion-Doped Glasses: Elastic and Magnetic Tunnelling States; G. Bellessa, et al. DC- Squid Magnetization Measurements of Single Magnetic Particles; W. Wernsdorfer, et al. IV: Macroscopic Coherence of Magnetization (Experiment). Macroscopic Quantum Tunnelling of Magnetization in Natural and Artificially Engineered Ferritin; S. Gider, D.D. Awschalom. V: Quantum Tunnelling of Domain Walls (Experiment). Domain Wall Tunnelling in a One Dimensional Ferromagnet; K. Hong, N. Giordano. VI: Dissipation inQTM (Theory). Nuclear Spin Dissipation in Magnetic Macroscopic Quantum Phenomena; A. Garg. Macroscopic Quantum Tunnelling and Dissipation of Domain Wall in Ferromagnetic Metals; G. Tatara, H. Fukuyama. The Collective Coordinate Method and Bloch Wall Motion; A.O. Caldeira. VII: Spin Parity Effects in QTM (Theory). Spin Parity Effects and Macroscopic Quantum Coherence of Bloch Walls; H.-B. Braun, D. Loss. Spin Environments and the Suppression of Quantum Coherence; N.V. Prokofev, P.C.E. Stamp. Unconventional Environments; P.C.E. Stamp. VIII: QTM & Electron-Electron Interactions (Theory). Particle Tunneling and Magnetization Tunneling in the Presence of Electron-Electron Interaction; J.M.P. Carmelo, F. Guinea. IX: Comments on Theory and Experiment. On the Search for Quantum Tunneling of Magnetization; L. Gunther. X: Macroscopic Quantum Tunneling in Superconductors (Experiment). Quantum Tunneling of Vortices in High-Tc Superconductors: Magnetic Relaxation Experiments in T1BaCACuO Compounds; D. Fiorani, et al. Crossover from Thermal to Quantum Regime in Vortex Motion in Conventional Type II Superconductors: Slow Magnetic Relaxation and Abrupt Flux Jumps; M. Uehara. Flux Motion by Quantum Tunneling; A.C. Mota. Macroscopic Quantum Tunneling in Long Josephson Junctions; O.G. Symko. XI: Quantum Computers (Theory). Quantum Computing and Spin Physics; D.P. DiVincenzo. XII: Scientific Summary of Workshop. B. Barbara, L. Gunther, A.J. Leggett. Index.