Table of contentsS. Inagaki: Elements of a Chemical Orbital Theory.- S. Inagaki: A Mechanistic Spectrum of Chemical Reactions.- S. Inagaki: Orbital Mixing Rule.- S. Inagaki: An Orbital Phase Theory.- T. Ohwada: Orbital Phase Environments and Stereoselectivities.- M. Ishida, S. Inagaki: p-Facial Selectivitiy of Diels-Alder Reactions.- J. Ma, S. Inagaki, Y. Wang: Orbital Phase Design of Diradicals.- Y. Naruse, S. Inagaki: Relaxation of Ring Strains.- S. Inagaki: Orbitals in Inorganic Chemistry: Metal Rings and Clusters, Hydronitrogens, and Heterocycles.-