Preface. Contributors. 1. Highly Accurate Ab Initio Computation of Thermochemical Data; T. Helgaker, W. Klopper, A. Halkier, K.L. Bak, P. Jorgensen, J. Olsen. 2. W1 and W2 Theories, and Their Variants: Thermochemistry in the kJ/mol Accuracy Range; J.M.L. Martin, S. Parthiban. 3. Quantum-Chemical Methods for Accurate Theoretical Thermochemistry; K. Raghavachari, L.A. Curtiss. 4. Complete Basis Set Models for Chemical Reactivity: from the Helium Atom to Enzyme Kinetics; G.A. Petersson. 5. Application and Testing of Diagonal, Partial Third-Order Electron Propagator Approximations; A.M. Ferreira, G. Seabra, O. Dolgounitcheva, V.G. Zakrzewski, J.V. Ortiz. 6. Theoretical Thermochemistry of Radicals; D.J. Henry, L. Radom. 7. Theoretical Prediction of Bond Dissociation Energies for Transition Metal Compounds and Main Group Complexes with Standard Quantum-Chemical Methods; N. Frohlich, G. Frenking. 8. Theoretical Thermochemistry: a Brief Survey; W. Thiel. Index.