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Ast 741 is a graduate course describing the interstellar medium; this is one of the core graduate courses required for the Ph.D. degree. The content of the course includes a description of the gas and dust components of the interstellar medium in ionized regions, atomic gas regions, and molecular gas regions of galaxies. Also included is a discussion of the different processes that are at work in the various phases of the ISM. Described is how data from x-ray, uv, optical, infrared, and radio wavelengths can be utilized to determine density, temperature, composition, ionization state, and the dynamics of each phase of the ISM. Comparison of the results with theoretical models is included. In addition, the course provides an overview of the processes that affect the global evolution of the ISM including: the incorporation of gas and dust in to stars; the dynamical effects of HII region, young stars, and supernovae; and the return of matter from evolved stars.

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