Introductory Survey. Mathematical Methods. Many-Electron Wavefunctions. Spin and Permutation Symmetry. Digression: The Electron Distribution. Self-Consistent Field Theory. Valence Bond Theory. Multiconfiguration SCF Theory. Perturbation Theory and Diagram Techniques. Large-Scale CI and the Unitary-Group Approach. Small Terms in the Hamiltonian. Static Properties. Dynamic Properties and Response Theory. Propagator and Equation-of-Motion Methods. Intermolecular Forces. Appendixes: Atomic Orbitals. Angular Momentum. Symmetry and Group Concepts. Relativistic Terms in the Hamiltonian. References. Index.