Lecture, three hours; discussion, one hour; tutorial, one hour. Requisite: course 113A. Complete introduction to electronic structure theory methods used by general computational chemistry community, focusing primarily on ab initio methods. Students gain understanding of electronic structure methods and tools to identify which methods are suitable for which types of systems. Methods covered include Hartree Fock, density-functional theory, perturbative methods, and modern high-correlation methods; and highlight algorithms necessary to implement these methods efficiently. Concurrently scheduled with course C213B. P/NP or letter grading.