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A bright future lies ahead for neutron scattering studies of materials, molecules, and condensed matter. The international science community and national sci-ence agencies are now building new instruments and new sources of neutrons that will overcome many of the historical limitations of neutron scattering re-search. Higher intensities and instrument sensitivities are major and obvious improvements. Experimental inelastic neutron scattering has been partic-ularly constrained by low countrates, forcing experimental compromises in energy resolution and intensity, for example. The ARCS inelastic neutron spectrometer with its location at the high-power target station of the Spalla-tion Neutron Source and with its high detection efficiency, for example, will provide unprecedented experimental productivity, overcoming many of the restrictions caused by the low countrates that have accompanied inelastic neutron scattering experiments to date. Advanced software is necessary to use this advanced hardware for so-phisticated experiments. The goal of this book is to describe the underlyin