Formal Methods: A Reaction Theory and the Relation Between Widths and Energy Shifts; F.B. Malik. The Control of Chaos; B.A. Huberman. Classical and Quantum Fluids: Compressible RayleighBenard Convection in a Hard Disks System; D. Risso, P. Cordero. Positron Annihilation as a Probe of Localized States in Fluids; B.N. Miller. Electronic Systems, Atoms, and Molecules: Lower Bound Aspects of Fermion Density Functionals; J.K. Percus. Selfconsistent Semiclassical Mean Field; M. Casas, et al. High Tc Superconductivity: Search of Superconductivity in Metal Clusters; M. Barranco, et al. Stochastic Processes: Reactant Segregation; H.S. Wio, et al. Nuclear and Particle Physics: A Direct Approach to the Tamm-Dancoff Approximation; R.C. Bochicchio, H. Grinberg. Overview Talk: Some Considerations on the Greenhouse Effect and Related Problems; V.M. Canuto. 30 additional articles. Index.