[en] During the past year the research under the contract has evolved along several lines consistent with a goal of achieving a better understanding of the interaction of molecules. First, appropriate theoretical collision techniques were developed and implemented for practical systems of interest. This activity emphasized the determination of key physical factors controlling inelastic collision behavior. Besides these efforts also initial work was carried out in new areas, principally chemical kinetic sensitivity analysis and the inversion of experimental relaxation data. A list of publications is included